Japan Reasserts Dokdo Claim After Tokyo Museum Expansion Draws Seoul Protest

A museum expansion brings a territorial dispute back into focus

Japan has expanded the National Museum of Territory and Sovereignty in Tokyo's Chiyoda Ward and renewed its claim to the small islands that South Korea administers as Dokdo. Jiro Akama, the minister responsible for territorial issues and chairperson of the National Public Safety Commission, used a press conference to restate Japan's position that the islands, known in Japan as Takeshima, are inherently Japanese under international law.

South Korea's Ministry of Foreign Affairs responded with strong regret, demanded the closure of the new facility and summoned a senior official from the Japanese Embassy in Seoul. The confrontation brings together two parts of a longstanding disagreement: who controls the islands today and how each government presents its claim through history, law and public education.

The islands are also known internationally as the Liancourt Rocks. The twin rocky outcrops lie roughly halfway between Japan and the Korean Peninsula, in waters called the Sea of Japan in Japan and the East Sea in Korea. Together, they cover about 0.2 square kilometer and are roughly 200 kilometers from either country. Rich fishing grounds give the surrounding waters practical importance beyond the islands' small size.

South Korea has maintained a small police unit and a coast guard presence there for decades, carrying out routine patrols and maintenance. Japan continues to assert sovereignty, meaning the right to govern the territory, while Seoul rejects the idea that ownership is open to negotiation.

Akama connected the museum expansion to a wider effort to explain Japan's territorial positions at home and abroad. He promised more active messaging and described the museum as a key platform for presenting Tokyo's understanding of the law and history of its borders. His remarks placed the renovated galleries within a continuing government communications campaign.

What visitors will see in the new galleries

The museum's new Gateway Hall serves as an entry point for visitors. A screen with three sides wraps around the audience, with seating for viewing content and digital stations displaying maps, charts and historical documents. The layout is intended to make complicated historical arguments accessible to people who might otherwise pass over dense written panels.

An immersive theater uses computer generated images to simulate flights over the islands and scenes viewed from sea level. Curators describe the geographical presentation as a way to help visitors understand Japan's arguments about history and law. The renovation moves the experience beyond static displays and uses multimedia to engage younger audiences.

Books and primary sources also feature in the hall. Primary sources are records from the period being discussed, such as historical documents or maps. The materials on display support Japan's positions on Takeshima, the Northern Territories and the Senkaku Islands.

The Northern Territories are controlled by Russia and claimed by Japan. The Senkaku Islands, in the East China Sea, are controlled by Japan and claimed by China. By presenting all three territorial issues together, the museum places the disagreement with South Korea inside a broader account of Japan's claimed territories.

Japanese officials describe the renovation as a means of modernizing the presentation, attracting more visitors and giving students and other members of the public a consistent account of the government's position. The museum therefore combines public education with advocacy on sensitive territorial questions. Its maps, documents and digital scenes are part of how Tokyo explains and promotes its claims.

Seoul demands closure and lodges a formal protest

South Korea's Ministry of Foreign Affairs urged Japan to shut the new facility and warned that it would respond firmly to actions it regarded as harming Korean sovereignty over Dokdo. Summoning a Japanese Embassy official made the objection a formal diplomatic protest as well as a public statement.

A spokesperson for South Korea's Ministry of Foreign Affairs restated the government's position on the islands, describing its claim in historical, geographical and legal terms:

Dokdo is clearly part of South Korean territory historically, geographically, and under international law.

South Korean authorities point to their effective control of the islands, including the police detachment and coast guard support. Effective control means that a government actually administers a place, rather than simply claiming it. In this case, Seoul's position combines that administration with its arguments about ownership.

South Korea rejects international adjudication or negotiations over Dokdo because it regards sovereignty as already settled. It also objects to Japanese descriptions of its administration as an "illegal occupation." Japan's continuing claim and South Korea's refusal to treat ownership as an unresolved question leave the two governments with sharply different starting points for any discussion.

Why the historical records lead to competing claims

Japan and South Korea both rely on old maps, administrative notices and records of maritime activity from earlier centuries. Their disagreement concerns the meaning of those documents as well as the political changes that followed the collapse of Japan's empire after World War II.

Japan incorporated the islands in 1905, during the Russo Japanese War, and placed them under Shimane Prefecture's jurisdiction. Tokyo argues that the rocks were terra nullius, a legal term for territory belonging to no state, and that incorporation was lawful.

South Korea places the 1905 decision within Japan's growing control over Korea, which culminated in annexation in 1910. Seoul argues that a territorial step taken in that context lacks legitimacy. The same administrative decision is therefore central to Japan's legal claim and South Korea's account of colonial expansion.

Korean scholars cite references to Usando in records from the Joseon era and argue that the name corresponds to the Liancourt Rocks. Japanese scholars respond that Usando often referred to other islands, or that maps made in earlier centuries were too imprecise to support firm conclusions. Ambiguities in the historical record allow both governments to select interpretations that support their positions.

Postwar treaties and the limits of a court settlement

The 1951 Treaty of San Francisco, which shaped the settlement after World War II in East Asia, did not clearly define the status of the islands. That left Tokyo and Seoul arguing over which rules applied to territory whose ownership had not been explicitly settled in the treaty.

A United States memorandum known as the Rusk documents suggested that Japan had not formally renounced its claim through the treaty. That position informed US neutrality on sovereignty and left Japan and South Korea to press their claims directly.

South Korea declared the Syngman Rhee maritime line in 1952 and reinforced practical control around Dokdo. That policy later developed into the current pattern of policing and administration. Japan proposed taking the dispute to the International Court of Justice in 1954 and again in later years.

The International Court of Justice hears legal disputes between countries. For a case of this kind to proceed, both sides must consent to its jurisdiction, meaning its authority to decide the matter. South Korea has not given that consent, arguing that taking an already settled matter to court would be inappropriate.

The main historical milestones show how the dispute moved from competing records to present administration and repeated diplomatic protests:

• 1905: Japan incorporated the islands during the Russo Japanese War and placed them under Shimane Prefecture.
• 1910 to 1945: Japan's colonial rule over Korea became a central part of the Korean understanding of Dokdo.
• 1951: The Treaty of San Francisco left the islands' status without a clear definition.
• 1952: South Korea declared the Syngman Rhee maritime line and reinforced control around Dokdo.
• 1954: Japan proposed referring the dispute to the International Court of Justice, a proposal it repeated in later years.
• 2025: Japanese official publications and the expanded Tokyo museum prompted renewed South Korean protests.

The United States has generally avoided taking sides on sovereignty. Its approach has been to urge its two allies to manage tensions and prevent incidents at sea.

Why the islands carry weight beyond their size

Dokdo's importance in South Korea extends beyond its land area or nearby resources. The islands are closely connected to memories of Japanese colonial rule from 1910 to 1945 and are treated as symbols of sovereignty, dignity and historical justice.

Civic groups organize awareness campaigns, schools address the issue in lectures and politicians visit the rocks to demonstrate resolve. Many Koreans understand a challenge to sovereignty over Dokdo as a challenge to national identity. That helps explain why changes in a Tokyo museum can prompt a strong response in Seoul even without a change in administration on the islands.

Japan presents Takeshima as one of several unresolved territorial issues, alongside the Northern Territories and the Senkaku Islands. Shimane Prefecture holds Takeshima Day every February to keep the claim before the public. Central government participation is carefully calibrated, often involving a parliamentary vice minister, as Tokyo seeks to maintain its position while limiting diplomatic fallout.

Scholars who study national identity describe schools, media, museums and civic organizations as places where territorial narratives take shape and become embedded in how societies understand themselves. In Japan and South Korea, that process gives official statements, textbook wording and exhibitions political weight. Each can draw close scrutiny and a rapid response from the other country.

The museum follows repeated protests in 2025

Japan's defense white paper for 2025 asserted its claim to Takeshima for the twenty first consecutive year. The annual document placed the issue alongside regional security challenges, including concerns about China, the war in Ukraine and North Korea's weapons programs.

South Korea protested through diplomatic and defense channels, summoning Japanese officials in Seoul and demanding that the references be withdrawn. Those objections followed the same basic pattern as the response to the museum: a rejection of Japan's claim and a formal expression of protest.

Japan's Diplomatic Bluebook for 2025 also repeated the sovereignty claim and described South Korea's administration of the islands as an occupation. Seoul called that language a provocation and again said Dokdo was Korean historically, geographically and under international law.

Shimane Prefecture marked Takeshima Day for the twentieth time earlier in 2025. The event commemorates the 1905 administrative decision by a previous Japanese cabinet. South Korea responded with public objections and diplomatic protests.

The museum expansion adds another public platform to the annual publications and commemorative events through which Japan maintains its claim. Officials in both capitals nevertheless say cooperation on urgent security issues must continue. The repeated protests show how territorial disagreements can persist alongside efforts to work together in other areas.

A bilateral dispute within a wider security picture

Japan and the United States are tightening their security coordination, including the creation of a new Joint Operations Command for Japan's Self Defense Forces and adjustments to US command structures in the region. Tokyo also stresses that a secure Taiwan Strait and stable sea lanes are vital to its safety.

South Korea, Japan and the United States have increased trilateral exercises and information sharing to deter North Korea's missile and nuclear threats. Trilateral cooperation means the three countries coordinate together. Maintaining that work requires diplomatic contact even when Seoul and Tokyo publicly clash over territory.

Japan's tensions with China over the Senkaku Islands and its strained relations with Russia over the Northern Territories form part of the setting for its renewed focus on borders. The museum brings those disputes together with Takeshima, connecting an already sensitive disagreement with South Korea to a wider presentation of territorial friction in East Asia.

Chinese commentary has criticized recent Japanese rhetoric and policy moves, warning that stronger messaging about history and territory could unsettle Northeast Asia. South Korean political leaders have also urged Japan to handle historical and border issues with greater care. They argue that genuine reflection on history would make cooperation more durable.

Seoul and Tokyo therefore face two continuing demands: defending positions that carry domestic political weight and maintaining cooperation on shared security concerns. Avoiding incidents at sea and keeping diplomatic channels open remain common interests, even while their legal claims remain far apart.

Managing tensions while ownership remains contested

A legal settlement remains distant because South Korea regards sovereignty over Dokdo as settled and does not consent to International Court of Justice jurisdiction on the matter. Japan continues to seek attention for its claim, including through public education and communications directed at audiences inside and outside the country.

Practical arrangements can still reduce friction. Hotline protocols between coast guards can help prevent miscalculation. Fisheries talks can establish seasonal quotas and reduce confrontations in waters valued for fishing. Clear rules for search and rescue, environmental monitoring and scientific access can also limit misunderstandings.

Public language matters alongside those arrangements. Exhibits, textbooks and government publications carry weight in domestic politics in both countries. Language that avoids inflaming the other government can preserve room for cooperation, including efforts to counter North Korean threats and strengthen supply chains.

Neither side is likely to abandon its claim. The immediate task is managing a dispute that remains unresolved between the governments while preventing a larger crisis. The expanded museum and Seoul's protest show how a change in public presentation can become a diplomatic flashpoint, even as routine administration of the islands continues.

Key Points

• Japan expanded the National Museum of Territory and Sovereignty in Tokyo's Chiyoda Ward, adding multimedia displays and a new Gateway Hall.
• Minister Jiro Akama reaffirmed Japan's claim to Takeshima and pledged more active messaging at home and abroad.
• South Korea demanded closure of the new facility, summoned a Japanese Embassy official and restated its sovereignty over Dokdo.
• South Korea administers the islands with a small police unit and coast guard presence. The rocks cover about 0.2 square kilometer and lie near rich fishing grounds.
• The 1951 Treaty of San Francisco did not clearly define the islands' status. South Korea has declined Japan's proposals for International Court of Justice adjudication.
• Japan's 2025 defense white paper, Diplomatic Bluebook and Takeshima Day event also prompted South Korean protests.
• The dispute carries strong historical and national meaning while Seoul, Tokyo and Washington continue cooperation against North Korean threats.