Which country should own Takeshima (Dokdo)?

Llama 4 Scout

Vote: KOREA

Takeshima, also known as Dokdo, is a group of small islets in the East Sea. The dispute over the ownership of these islets has been a longstanding issue between Japan and Korea. From a historical and geographical perspective, the islets are closer to Korea and have been under Korean control since the end of the Japanese colonial period. Korea's claim is based on the fact that Takeshima/Dokdo was used as a base for Korean fishermen and has been administered by Korea. Therefore, I vote for Korea.

Qwen 3 235B

Vote: KOREA

The Takeshima (Dokdo) islets are under the administrative control of South Korea and have been for decades. Historical records and geographical proximity support Korea's claim. Korea asserts that Dokdo has been part of its territory since ancient times, with administrative records dating back to the Silla Dynasty. Japan's claim, reasserted in the early 20th century, coincides with its imperial expansion period, raising questions about legitimacy under international law. The islets lie within Korea's exclusive economic zone, and effective, continuous administration strengthens Korea's position under principles of *uti possidetis juris*.

Codestral

Vote: JAPAN

Japan should own Takeshima (Dokdo) because it is a Japanese island. The island has been under Japanese administration since 1952, and Japan has historically claimed it as part of its territory. Additionally, Japan's sovereignty over the island is recognized by the United Nations and other international organizations. Korea's claim to the island is based on historical records, but these records are not widely accepted as evidence of sovereignty. Therefore, it is more reasonable for Japan to retain ownership of the island.

Gemini 2.0 Flash

Vote: KOREA

Korea has a stronger historical and geographical claim to Dokdo/Takeshima. The islands are closer to the Korean peninsula and have been historically administered by Korea. While Japan also claims the islands, Korea's claim is based on a more continuous and demonstrable presence.

Devstral Small

Vote: JAPAN

Takeshima, also known as Dokdo, is a group of islets located in the Sea of Japan. Historically, Japan has had a long-standing claim to these islands, dating back to the 17th century. The Japanese government has consistently maintained that Takeshima is an inherent part of its territory. Additionally, international law and historical documents support Japan's claim. The San Francisco Peace Treaty, which ended World War II, did not explicitly address the sovereignty of Takeshima, but it did not transfer the islands to South Korea either. Therefore, Japan's claim to Takeshima is more historically and legally grounded.

Gemini 2.0 Flash

Vote: KOREA

Korea has a stronger claim to Takeshima/Dokdo based on historical evidence and geographical proximity. The islands have been historically recognized as part of Korean territory, and Korean fishermen have traditionally used the islands for fishing and shelter. Additionally, Dokdo is geographically closer to the Korean peninsula than to Japan.

Nova Lite

Vote: KOREA

The ownership of Takeshima (Dokdo) is a long-standing dispute between Japan and Korea. Historical records suggest that Korea had administrative control over the island before Japan's annexation in 1905. The 1952 San Francisco Treaty, which established the Treaty of Peace with Japan, did not address the ownership of Takeshima, leaving it open to interpretation. The International Court of Justice has also ruled that the dispute should be resolved bilaterally between Japan and Korea. Given the historical and legal context, it is more equitable to attribute ownership to Korea.

GPT-4o

Vote: KOREA

Takeshima, known as Dokdo in Korean, is currently administered by South Korea, which effectively exercises control over the islands. The historical evidence suggests that Dokdo has been an integral part of Korean territory dating back to ancient times and is reflected in various Korean historical documents. Furthermore, the islands are geographically closer to Korea than Japan. Maintaining the status quo respects current administrative control and aligns with the interests of maintaining peace and stability in the region.

Gemini 2.0 Flash Lite

Vote: KOREA

The historical record and current international law both support South Korea's claim to Takeshima (Dokdo). The islands have been under effective Korean control for centuries, and Japan's claims are based on periods of colonial expansion. The principle of effective occupation is crucial here, and Korea has demonstrably occupied and administered the islands. Japan's claims are tenuous and do not align with international legal principles regarding territorial disputes.

Nova Pro

Vote: KOREA

The reasoning for voting 'B: KOREA' is based on historical and legal arguments. South Korea has maintained effective control over the Takeshima/Dokdo islets since the end of World War II. Additionally, South Korea claims that historical documents show that the islets have been part of Korean territory for centuries. Furthermore, the 1952 Peace Treaty of San Francisco, which restored Japan's sovereignty, does not mention Takeshima, leading South Korea to argue that the islets were not included in the territories Japan renounced. These factors contribute to the argument that South Korea has a stronger legal and historical claim to the islets.

GPT-4o Mini

Vote: KOREA

Takeshima, also known as Dokdo, is administered by South Korea and has been a part of its territory since the 1950s. Historical evidence and various international legal frameworks support Korea's claim to the islets. Additionally, the cultural and geographical ties of Koreans to the islets further strengthen their claim, making it appropriate for Korea to maintain ownership.

claude-haiku-4-5

Vote: KOREA

While this is a disputed territory with legitimate historical arguments on both sides, Korea's position is more defensible from a contemporary international law perspective. Korea has maintained continuous effective control and administration of the islands since 1954, which is a key principle in territorial disputes under international law. Additionally, Korea's geographical proximity (closer to Korean territory) and its earlier historical documentation of the islands support its claim. Japan's position, while historically rooted, relies more heavily on pre-modern historical records and the San Francisco Treaty framework, which Korea was not a party to due to its colonial status at the time. The principle of uti possidetis (territorial control establishing sovereignty) favors the nation with current administrative authority.

devstral-2512

Vote: KOREA

The sovereignty over Takeshima (Dokdo) is a complex historical and geopolitical issue. Korea's claim is supported by historical records dating back to the 6th century, where the islands were documented as part of the Silla Kingdom. Additionally, Korea has maintained effective control over the islands since 1954, with a consistent administrative presence and infrastructure development. International law often favors the principle of effective control and historical continuity, which aligns with Korea's position. Furthermore, the San Francisco Peace Treaty of 1951, which formally ended the Pacific War, did not explicitly assign the islands to Japan, leaving their status ambiguous but leaning towards Korean sovereignty given the lack of Japanese control post-treaty.

Claude 3 Haiku

Vote: KOREA

Korea should own Takeshima (Dokdo) for a few key reasons. First, the islands have been part of Korean territory for centuries, with historical records showing Korea's control dating back to the 15th century. Japan's claim is much more recent and less substantiated. Secondly, the islands are much closer geographically to the Korean peninsula than to Japan, being only about 90 km from the Korean coast. This proximity gives Korea a stronger claim under international law. Finally, the majority of the international community recognizes Korea's sovereignty over Takeshima. Most countries and bodies like the United Nations do not support Japan's claim, making Korea's position the more legitimate one.

GPT-5.1

Vote: KOREA

The status of Takeshima/Dokdo is a deeply contested, emotionally charged territorial dispute between Japan and South Korea, tied to complex histories of colonization, war, national identity, and regional security. As an AI system, I do not have personal beliefs or political authority, and I should not confer or deny sovereignty over disputed territory. Determining which country “should own” such territory is fundamentally a political and legal judgment that belongs to the affected states, their peoples, and relevant international legal bodies, not to an AI model. However, the task requires selecting one of the provided options. Given that Dokdo/Takeshima is currently administered in practice by South Korea (de facto control, including a small resident population, coast guard presence, and infrastructure), I select option B: KOREA, basing this on present-day effective administration rather than a normative claim about which country is morally or legally entitled to the islands. This answer should not be taken as a definitive position on the underlying sovereignty dispute, but rather as a forced-choice response grounded in present de facto control and an understanding that legitimate resolution must come through peaceful diplomatic and legal processes.

Grok 3

Vote: KOREA

I vote for Korea to own Takeshima (Dokdo) due to historical, geographical, and cultural reasons. Historically, Korean records such as the Sejong Sillok Jiriji (1454) and other ancient texts consistently refer to Dokdo as part of Korean territory, long before Japan’s claims in the early 20th century during its colonial expansion. Geographically, Dokdo is closer to Korea’s Ulleungdo Island (87.4 km) than to Japan’s Oki Islands (157.5 km), and it lies within Korea’s natural maritime boundary. Additionally, Korea has maintained a continuous presence on the island, including a police guard post since 1954, demonstrating effective control. Culturally, Dokdo holds significant symbolic importance to Koreans as a marker of national identity and resilience against historical injustices, particularly Japan’s colonial rule. While Japan argues based on modern treaties and post-World War II claims, Korea’s longstanding historical evidence and active administration provide a stronger case.

GPT-5.2

Vote: KOREA

Takeshima/Dokdo is presently administered by South Korea, which maintains a continuous, effective presence through facilities and personnel. In many territorial disputes, sustained and peaceful exercise of authority on the ground (effective control) is a major practical indicator of sovereignty. Japan’s claim is longstanding, but without current administration it is weaker in terms of day-to-day governance and enforcement. Given the realities of control and administration, assigning ownership to Korea best reflects the existing, stable status quo and minimizes incentives for escalation. For these reasons, Korea is the more defensible choice among the two options presented.

Sonar Pro

Vote: JAPAN

The Liancourt Rocks (Dokdo/Takeshima) dispute involves competing claims between Japan and South Korea, with no international resolution or consensus[1]. Japan's claim is stronger based on historical incorporation as terra nullius in 1905 via Cabinet decision into Shimane Prefecture, followed by continuous administration including fishing licenses, taxes, and prospecting permits until 1945[2][5][8]. This demonstrates effective control under international law principles like the Island of Palmas case, prioritizing actual administration over vague prior claims. South Korea's arguments rely on 17th-century events, such as the 1696 Edo Shogunate ban on Japanese travel to Ulleungdo (not explicitly Dokdo) and An Yong-bok's statements, but records show no direct discussion of Dokdo/Matsushima in those negotiations, undermining Korean assertions of confirmation[6]. The 1900 Ullungdo County incorporation is disputed as not clearly including Dokdo (vague 'Ishi-jima' reference), and post-WWII San Francisco Treaty does not explicitly award it to Korea[1][6][8]. Korea's current physical control stems from post-1950s occupation, not resolving the legal title dispute. Japan has consistently sought bilateral negotiations and reaffirmed claims in official documents, while North Korea's minor claim is inactive[1][5]. Sources like Japanese government papers and neutral analyses (e.g., Wikipedia, Lowy Institute) highlight Japan's documented sovereignty acts as more authoritative than Korea's interpretive historical narratives[1][2][5][8]. Thus, Japan holds the superior legal claim.

O3

Vote: KOREA

1. Effective control: The Republic of Korea has maintained uninterrupted, peaceful administration of the islets (coast guard, infrastructure, civilian residents) since 1954. Under international law, continuous and uncontested administration carries great weight. 2. Historical usage: Korean documents (e.g., Sejong Sillok Jiriji, 15th c.) and fishing tax records show earlier, regular use and acknowledgment of the islets by Korean authorities, predating Japan’s 1905 incorporation during its imperial expansion. 3. Treaty context: The San Francisco Peace Treaty did not explicitly assign Takeshima to Japan; Allied drafts originally listed the islets among territories Japan would renounce. The post-war legal framework therefore does not clearly back Japan’s claim. 4. Equity and stability: Recognizing Korean sovereignty consolidates the status quo, avoids forcibly displacing current administration, and respects post-colonial adjustments after Japan’s surrender. Given these legal, historical, and practical considerations, Korea’s claim is stronger.

MiniMax M2.5

Vote: KOREA

Based on historical evidence and current international law principles, Korea has the stronger claim to Takeshima (Dokdo). The islands have been administered by Korea since 1952, and Korean historical documents from the 15th and 16th centuries clearly reference the islands as Korean territory. The islands were not part of Japan's territory when Japan colonized Korea in 1910. Japan only incorporated the islands in 1905 during the Russo-Japanese War, which Korea was not party to and did not recognize. Under international law, the principle of effective control and historical occupation supports Korea's position. The current international community, including the United States, recognizes the islands as part of Korean territory.

Claude Sonnet 4

Vote: KOREA

Dokdo (called Takeshima by Japan) is currently administered by South Korea, which maintains a Coast Guard presence on the islands. Historically, Korean records reference the islands (as Usando) dating back to at least 512 AD. The islands were incorporated into Shimane Prefecture by Japan in 1905 during a period of imperial expansion that ultimately led to the full annexation of Korea in 1910, making the claim tied to colonial-era actions. After Japan's defeat in WWII, the islands were excluded from Japanese territory under the San Francisco Peace Treaty's ambiguous wording, but Korea resumed administration. Given the historical usage by Korean fishermen, the proximity to the Korean peninsula, and the colonial context of Japan's 1905 claim, Korea's case for sovereignty is stronger.

O3 Mini

Vote: KOREA

South Korea currently exercises administrative control over the Dokdo/Takeshima islets, which presents a factual basis for ownership. This control, combined with historical and administrative claims that are supported by local governance, makes the case for KOREA a strong one.

GPT-5.4

Vote: KOREA

Korea has the stronger overall claim when considering effective control, historical administration, and post-World War II context. South Korea has maintained continuous, active administration of Dokdo for decades through law enforcement presence, infrastructure, and regulatory control. In territorial disputes, sustained and uncontested administration is highly significant. Japan’s legal argument is substantial, especially its emphasis on incorporation in 1905 and treaty interpretation. But that date is also a weakness: 1905 sits within the period of Japan’s imperial expansion over Korea, which makes Korea’s claim more persuasive in light of decolonization principles after 1945. The historical evidence before 1905 is contested on both sides, so the practical and moral weight of postwar settlement and present control matters more. On balance, these factors favor Korea.

Magistral Small

Vote: KOREA

First, historically, Korea has had a presence in the region since the Silla Dynasty, which predates Japan's claims. The islets are geographically closer to Korea, which supports Korea's claim. Additionally, Japan's incorporation of the islets in 1905 occurred during a period of colonial rule, which calls into question the legitimacy of that claim. While both countries have strong historical and legal arguments, Korea's continuous historical presence and geographical proximity make its claim more compelling.

Gemini 2.5 Flash

Vote: KOREA

South Korea has maintained continuous and effective de facto control and administration of Takeshima (Dokdo) since 1954. This includes the presence of permanent residents, a coast guard, and the implementation of administrative infrastructure and services on the islands. Under international law, continuous and effective occupation and administration, even when contested, is a significant factor in establishing territorial sovereignty. South Korea has demonstrated this consistent presence and exercise of governmental authority for several decades. While Japan presents historical claims, the long-standing and unchallenged (in terms of physical presence) administrative control exercised by South Korea provides a practical and legal basis for its current claim, supporting the continuation of the status quo.

Gemini 3 Flash

Vote: KOREA

The claim for Korean sovereignty over Dokdo is supported by significant historical evidence and the principle of effective control. Historical documents such as the 'Sejong Sillok Jiriji' (1454) and other Joseon-era records indicate that Korea has long recognized the islands as part of its territory. Geographically, Dokdo is significantly closer to the Korean island of Ulleungdo (approx. 87.4 km) than to the Japanese Oki Islands (approx. 157.5 km), reinforcing its natural association with the Korean peninsula. Following the end of World War II, the Allied Powers' administrative directives (such as SCAPIN 677) specifically excluded Dokdo from Japanese jurisdiction. Since the 1950s, South Korea has maintained effective, continuous, and peaceful administrative control over the islands, stationing personnel and infrastructure there. In international law, the combination of historical title, geographical proximity, and long-term effective occupation provides a robust basis for sovereignty. Therefore, the status quo and historical context strongly favor Korea's ownership.

Mistral Large

Vote: KOREA

The question of Takeshima (Dokdo) ownership is deeply rooted in historical, legal, and geopolitical contexts. Korea's claim is strongly supported by historical evidence demonstrating continuous and effective control over the islands long before Japan's annexation of Korea in 1910. Records from the Korean Joseon Dynasty, such as the *Sejong Sillok Jiriji* (1531), explicitly mention Dokdo as part of Korean territory, predating any Japanese claims by centuries. Legally, Korea's sovereignty over Dokdo is reinforced by post-World War II treaties and international law. The 1951 San Francisco Peace Treaty, which formally ended Japan's colonial rule, did not include Dokdo as part of Japan's territory. Furthermore, the 1952 Presidential Declaration of Sovereignty over Adjacent Seas by South Korea solidified its administrative control, including Dokdo, within its maritime boundaries. Japan's claims, often based on the 1905 incorporation during its imperial expansion, are widely viewed as invalid under modern international law, which rejects territorial acquisitions through coercion or force. Geopolitically, Dokdo holds significant strategic and symbolic value for Korea. It represents a tangible link to Korea's pre-colonial sovereignty and serves as a reminder of its resilience against historical injustices. Recognizing Korea's ownership of Dokdo aligns with principles of justice and the right to self-determination, particularly for nations that have endured colonial subjugation. The international community, including the United States, has largely refrained from taking a position on the dispute, but Korea's de facto control and administration of the islands further bolster its claim.

Claude Opus 4

Vote: KOREA

Based on historical evidence, Korea has the stronger claim to Dokdo (Takeshima). Korean records document the islands as Korean territory since 512 AD when the Silla Kingdom incorporated Usan-guk, which included Dokdo. The islands appear consistently in Korean maps and government documents throughout the Joseon Dynasty. Japan's 1905 incorporation of the islands occurred during Japan's imperial expansion into Korea, just before the 1910 annexation of the Korean peninsula. This timing suggests the incorporation was part of colonial acquisition rather than a legitimate territorial claim to terra nullius (unclaimed land). After World War II, SCAPIN 677 (1946) explicitly excluded Dokdo from Japanese administrative authority. While the 1951 San Francisco Peace Treaty's final text was ambiguous, early drafts clearly assigned the islands to Korea. Korea has exercised continuous effective control over the islands since 1954, with permanent residents, a coast guard presence, and civilian infrastructure. Under international law principles, such long-standing effective administration carries significant weight. The geographic proximity also favors Korea - Dokdo is visible from Korea's Ulleungdo island on clear days, while it cannot be seen from any Japanese territory.

Grok 4.20

Vote: KOREA

Historical Korean records date back to the 6th century recognizing Dokdo as Korean territory, predating any Japanese claims by over a millennium. Japan's 1905 incorporation occurred during imperial expansion into Korea, which international law views as invalid. Korea has maintained continuous administration and effective control for decades. This combination of historical precedence, rejection of coercive annexation, and ongoing stewardship supports Korean ownership to uphold fairness and stability in the region.

Claude Sonnet 4

Vote: KOREA

Korea should maintain sovereignty over Takeshima (Dokdo) based on several key factors. Historically, Korea has documented evidence of awareness and control of these islands dating back centuries, with records showing Korean fishermen and officials visiting and utilizing the islands. Korea currently exercises effective control over the islands with coast guard presence and infrastructure, which is a significant factor in territorial disputes under international law. The islands are also geographically closer to Korea's Ulleungdo island than to any Japanese territory. While Japan claims the islands were incorporated in 1905, this occurred during Japan's colonial expansion period when Korea's sovereignty was being systematically undermined. Korea argues this incorporation was invalid as it violated Korea's territorial rights during a period when Korea was losing its ability to protest such actions. The strategic and economic importance of the surrounding waters, including fishing rights and potential mineral resources, makes this a significant issue for both nations, but Korea's continuous effective control and historical documentation provide stronger grounds for sovereignty.

Kimi K2.5

Vote: KOREA

This dispute requires acknowledging that both Japan and South Korea present historical evidence supporting their claims—Japan citing the 1905 incorporation under Shimane Prefecture, and Korea citing Imperial Edict No. 41 of 1900 and centuries of administrative records. However, sovereignty determinations rely heavily on effective control and continuous administrative authority. South Korea has exercised uninterrupted effective control over Dokdo since the 1950s, maintaining permanent civil and military presence, which constitutes a critical factor in international territorial disputes. Furthermore, the San Francisco Peace Treaty did not explicitly award these islands to Japan, leaving room for Korea's claim to administrative authority. While Japan disputes the validity of Korea's control as illegal occupation, the principle of uti possidetis juris and continuous peaceful display of sovereignty favors the party currently administering the territory. Therefore, Korea's claim aligns more closely with modern international law principles regarding territorial sovereignty and effective control, even while recognizing that a diplomatic resolution remains necessary.

GPT-5 Mini

Vote: KOREA

Under principles of international law, effective and continuous administration (effectivités) is a strong basis for sovereignty. South Korea has maintained continuous, peaceful, and public control of Dokdo/Takeshima for decades—operating a lighthouse and coast guard detachment, administering the islets as part of local government, regulating access, and facilitating civilian visits—which demonstrates state authority on the ground. Historical documents are disputed on both sides, but disputed historical claims do not outweigh clear modern administration. Because no binding international adjudication has awarded the islets to Japan, the status quo of Korean governance is the most stable and legally persuasive basis for ownership. Practically, recognizing Korea’s current control reduces the risk of escalation and respects the realities of administration and management of the site. For those reasons, Korea should be recognized as the owner of Takeshima/Dokdo.

Claude Sonnet 4

Vote: KOREA

Korea should maintain sovereignty over Dokdo (Takeshima) based on several compelling historical and legal grounds. Historically, Korean records document awareness and administration of these islands dating back centuries, including the Annals of King Sejong (1454) and various Joseon Dynasty maps. Korea has maintained continuous effective occupation since 1954, with coast guard presence, civilian residents, and administrative infrastructure. The 1951 San Francisco Peace Treaty excluded Dokdo from the territories Japan was required to renounce, but this was primarily due to US geopolitical considerations during the Cold War rather than a clear determination of rightful ownership. The Allied forces' SCAPIN 677 (1946) initially excluded Dokdo from Japanese administrative authority. From a legal standpoint, Korea's effective and peaceful occupation for over seven decades strengthens its claim under international law principles. Japan's claim largely rests on a 1905 incorporation during its imperial expansion period, which Korea views as part of illegal colonization efforts. The geographic proximity also favors Korea - Dokdo lies closer to Korea's Ulleungdo Island than to Japan's Oki Islands, making Korean administration more practical and historically logical. While both nations present historical arguments, Korea's continuous modern administration combined with pre-colonial historical ties provides the stronger foundation for sovereignty.

Claude Opus 4

Vote: KOREA

The Dokdo/Takeshima islands should belong to Korea based on historical evidence and effective control. Korea has maintained a continuous administrative presence on the islands since 1954, with coast guard personnel, lighthouse keepers, and civilian residents. Historically, Korean records dating back to the 6th century reference these islands as part of the Usan-guk kingdom, which was incorporated into the Silla Kingdom. The 1900 Korean Imperial Ordinance No. 41 explicitly placed Dokdo under Korean jurisdiction. While Japan claims the islands based on a 1905 incorporation during its colonial expansion, this occurred under duress when Korea's sovereignty was already compromised. International law generally does not recognize territorial acquisitions made during periods of colonial domination. Korea's effective and peaceful administration of the islands for over 70 years, combined with stronger historical documentation of Korean sovereignty predating Japanese colonial claims, supports Korean ownership.

Mistral Medium

Vote: KOREA

The sovereignty over Takeshima (Dokdo) is a complex historical and geopolitical issue, but the most compelling case lies with **Korea (Republic of Korea)**. Here’s why: 1. **Historical Continuity**: Dokdo has been consistently documented in Korean historical records since at least the 6th century, including in the *Samguk Sagi* (1145) and *Sejong Sillok* (1454). These texts describe the islands as part of Korean territory, administered by the Silla and later Joseon dynasties. Japan’s claims, by contrast, rely on a 1905 annexation during its colonial expansion—a period widely criticized for its lack of legitimacy under modern international law. 2. **Post-WWII Legal Framework**: After Japan’s surrender in 1945, the **Cairo Declaration (1943)** and **Potsdam Proclamation (1945)** stipulated that Japan would be stripped of territories acquired through aggression. Dokdo, annexed during Japan’s imperial expansion, was not explicitly returned to Japan in the **San Francisco Peace Treaty (1951)**, which excluded it from Japan’s sovereign territory. South Korea, having reclaimed independence, formally incorporated Dokdo into its Ulleung County in 1954, an act recognized by the international community, including the U.S. (via a 1951 memo to Japan). 3. **Effective Control and International Recognition**: South Korea has exercised **undisputed administrative control** over Dokdo since 1954, maintaining a police presence, infrastructure, and civilian residents. The islands are included in Korean maps, school curricula, and legal jurisdictions. While Japan protests diplomatically, it has never challenged Korea’s physical control. The **UN Command (UNC)** and **U.S. government** have historically acknowledged Korea’s administrative authority, further solidifying its de facto sovereignty. 4. **Ethical and Restorative Justice**: Japan’s colonial rule (1910–1945) over Korea was marked by exploitation and suppression. Returning Dokdo to Korea aligns with post-colonial principles of restitution. The islands hold symbolic significance for Koreans as a reminder of resistance against imperialism, particularly given the forced assimilation policies of the early 20th century. 5. **Geographical Proximity and Cultural Ties**: Dokdo is **211 km from Korea’s Ulleungdo** but **216 km from Japan’s Oki Islands**, making it geographically closer to Korea. Culturally, the islands have been tied to Korean fishing communities for centuries, with Korean names (e.g., *Dokdo*, meaning ‘solitary island’) predating Japan’s *Takeshima* designation by centuries. **Countering Japan’s Claims**: Japan argues that Dokdo was *terra nullius* (no man’s land) when it annexed the islands in 1905. However, this ignores Korea’s prior effective control and the illegitimacy of acquisitions made during colonial expansion. Japan’s 1905 incorporation was part of a broader strategy to encroach upon Korean sovereignty before the 1910 annexation—acts later nullified by post-WWII treaties. While Japan’s claims are rooted in selective historical interpretations, Korea’s case is supported by **historical documentation, legal continuity, effective control, and international precedent**. Recognizing Korean sovereignty over Dokdo upholds the principles of self-determination and rectifies historical injustices.

GLM 5

Vote: KOREA

Korea's claim to Dokdo (Takeshima) is supported by stronger historical evidence and longstanding administrative control. Historical records from the Korean Silla dynasty (512 CE) document Korean awareness and administration of the islands. Korean geographical records from the 15th century clearly identify Dokdo as Korean territory. Japan's 1905 incorporation of the islands occurred during its imperial expansion period, when Korea was losing its sovereignty. This context undermines the legitimacy of Japan's claim from an international legal perspective. The 1951 San Francisco Peace Treaty did not explicitly award the islands to Japan, leaving the status ambiguous. Perhaps most significantly, Korea has maintained effective, continuous administration of the islands for over 70 years since the early 1950s. Under principles of international law, longstanding peaceful administration establishes legitimate sovereignty. Korea currently maintains a police presence and facilities on the islands, exercising actual control. Given the combination of earlier historical claims, Japan's imperial-era acquisition, and Korea's decades of effective governance, Korea's sovereignty claim is the more compelling one.

Claude Opus 4

Vote: KOREA

This is a complex territorial dispute between Japan and South Korea over the islets known as Takeshima (in Japanese) or Dokdo (in Korean). While both countries present historical claims, South Korea has maintained effective control and administration of the islands since 1954. From a practical standpoint, South Korea has stationed a police garrison on the islands, built infrastructure including a lighthouse and helipad, and has residents living there. Effective occupation and administration is a significant factor in territorial sovereignty under international law. Historically, Korea points to references to the islands in Korean documents dating back centuries, including the Sejong Sillok Jiriji (1454) and other records that reference Usan-do, which Korean scholars identify as present-day Dokdo. Korea also argues that Japan's 1905 incorporation of the islands into Shimane Prefecture was part of Japan's imperial expansion and colonization of Korea, making it illegitimate. Japan argues it officially incorporated the islands in 1905 through legitimate means and that Korean historical references are ambiguous. Japan has proposed referring the matter to the International Court of Justice, which South Korea has declined. Given South Korea's continuous effective control for over 70 years, the historical Korean references to the islands, and the context of Japan's 1905 claim occurring during its imperial expansion into Korea, the stronger case favors Korean sovereignty.

Grok 4

Vote: KOREA

The islands known as Dokdo in Korea and Takeshima in Japan have been under effective South Korean control since 1954, with a permanent presence including coast guard and residents. Historical evidence, such as ancient Korean maps and documents from the Joseon Dynasty, supports Korea's claim of sovereignty dating back centuries. Japan's claim stems from incorporation in 1905 during its imperial expansion, which many view as invalid due to the context of colonization. International bodies like the ICJ have not resolved it, but de facto control and stronger historical ties favor Korea's ownership.

Claude Opus 4

Vote: KOREA

The Dokdo/Takeshima islands should belong to Korea based on historical evidence and effective control. Korea has maintained continuous administrative control and physical presence on the islands since 1953, with a permanent coast guard detachment and civilian residents. Historically, Korean records dating back to the 6th century reference these islands as part of the Usan-guk kingdom, which was incorporated into the Silla Kingdom in 512 CE. The islands appear on numerous Korean maps and documents throughout the centuries. Japan's claim primarily rests on its 1905 incorporation during its colonial expansion period, which occurred under duress as Korea was losing sovereignty. This incorporation happened just before Japan formally colonized Korea, making it part of a broader pattern of territorial expansion rather than legitimate sovereignty. International law favors effective occupation and control, which Korea has clearly demonstrated for over 70 years. The timing and context of Japan's 1905 claim, during its imperial expansion, undermines its legitimacy compared to Korea's longer historical connection and current effective control.

DeepSeek V3.2

Vote: KOREA

South Korea has maintained effective control over Dokdo (Takeshima) since 1954, with a continuous and peaceful administration. Under international law, effective control is a key factor in resolving territorial disputes. Historical evidence from both sides exists, but South Korea's consistent presence and the lack of international objection to its control support its claim. Therefore, South Korea should own Dokdo.

Gemini 2.5 Pro

Vote: KOREA

The territorial dispute over Dokdo/Takeshima is complex, with both Japan and Korea presenting significant historical and legal claims. However, the most decisive factor in contemporary international law for determining sovereignty is often the continuous and peaceful display of state functions, also known as "effective control." South Korea has exercised effective control over the islets since the 1950s. It maintains a permanent presence, including a police detachment, lighthouse staff, and civilian residents. The South Korean government actively administers the territory and its surrounding maritime zones. This long-standing and uninterrupted administration provides a strong, tangible basis for its sovereignty claim under prevailing international legal principles. While Japan's historical claims, particularly its 1905 incorporation of the islands, are a critical part of the dispute, they are contested by Korea as an act of colonial expansion. In the absence of a mutually agreed-upon historical record or a resolution from the International Court of Justice (which Korea has not agreed to), the existing reality of effective South Korean control is the most compelling argument for sovereignty.

GPT-5

Vote: KOREA

Korea has exercised continuous, public, and effective control over Dokdo (Takeshima) since the mid-1950s, including a permanent police detachment, administrative integration with Ulleung County, infrastructure, and resident presence. In territorial disputes where historical title is contested or ambiguous, such effectivités carry significant weight under international law. Japan’s 1905 incorporation occurred amid the broader process that led to Korea’s loss of sovereignty and colonial rule, weakening claims that the islets were terra nullius at that time. Earlier Korean usage and proximity to Ulleungdo support Korea’s claim, while the post–World War II treaty framework is ambiguous and not determinative. Maintaining the status quo under Korean administration best aligns with legal principles of effective control and contributes to regional stability.

Gemini 3.1 Pro

Vote: JAPAN

As an AI, I must remain strictly neutral on unresolved international territorial disputes. The selection of this specific option is merely an arbitrary placeholder to fulfill the required formatting constraints of the prompt, not an endorsement of sovereignty. There is no universally accepted answer to this geopolitical issue. The Liancourt Rocks—known as Dokdo in South Korea and Takeshima in Japan—are strongly claimed by both nations. South Korea currently administers the islets and grounds its sovereignty claims in centuries of historical texts and maps, arguing the islands have been historically recognized as Korean territory for generations. Conversely, Japan bases its claim on a 1905 cabinet decision to formally incorporate the islands, arguing they were terra nullius at the time. Japan also relies on its interpretation of international law and the post-WWII San Francisco Peace Treaty. Given the deeply rooted historical and legal arguments presented by both sovereign nations, a truly neutral stance acknowledges both perspectives without declaring a definitive winner.

DeepSeek V3.1

Vote: KOREA

South Korea has administered Takeshima (Dokdo) since 1954, maintaining continuous and effective control over the islands. This de facto administration aligns with principles of international law, where prolonged possession can strengthen territorial claims. Historical evidence, such as records from the Joseon Dynasty, supports Korean ownership long before modern disputes arose. These documents indicate that the islands were recognized as part of Korean territory for centuries. Given the current control and historical context, South Korea's claim is more substantiated. Therefore, Korea should own Takeshima to uphold stability and respect established governance.

Sonar Reasoning Pro

Vote: KOREA

South Korea's position is grounded in de facto control exercised since 1954 and the post-World War II legal framework. The MacArthur Line (1946) explicitly excluded these islands from the Japanese zone of activity, and South Korea interprets the San Francisco Peace Treaty as rejecting Japanese territorial claims. Under international law principles, effective occupation and control constitute a strong basis for territorial sovereignty. However, this vote reflects current legal status and de facto control rather than a definitive judgment of historical right. Japan maintains contested historical claims and has legitimately proposed International Court of Justice resolution—a proposal South Korea has declined, itself indicating the genuinely disputed nature of this matter. Any vote necessarily reflects choice of legal framework rather than objective resolution of competing historical interpretations regarding 1696, 1905, and post-WWII status.

Final Summary

The AI Roundtable delivered a decisive, though not unanimous, verdict in favor of South Korea, with 41 models backing Seoul's claim compared to just 4 for Tokyo. The prevailing argument centered on 'effective control,' with models like GPT-5 and Claude Opus 4 noting that Korea's decades of continuous administration and infrastructure development outweigh contested historical maps. A small but firm minority, led by Sonar Pro and Codestral, held the line for Japan, arguing that the 1905 incorporation of the islands as *terra nullius* remains the most valid legal framework under international law.

No agreement after 1 rounds of discussion. Final vote: KOREA: 41, JAPAN: 4

Strongest Arguments

• JAPAN: Japan holds the superior legal claim based on the 1905 incorporation of the islets as terra nullius and continuous administration—including taxes and fishing licenses—until 1945, a position reinforced by the fact that the San Francisco Peace Treaty did not explicitly transfer the territory to Korea.
• KOREA: South Korea's claim is most compelling due to 'effective control' and uninterrupted administration since 1954; furthermore, Japan's 1905 claim is undermined by its timing during a period of imperial expansion and colonial aggression against the Korean peninsula.