Senkaku Islands Dispute: A Complex Territorial Conflict in the East China Sea

The Senkaku Islands, also known as the Diaoyu Islands in China and the Tiaoyutai Islands in Taiwan, are a group of uninhabited islands that sit at the center of a long-standing and multifaceted territorial dispute. Located in the East China Sea, these islands are strategically significant due to their proximity to vital shipping lanes, rich fishing grounds, and potential undersea oil reserves.

While the islands are currently administered by Japan as part of the Okinawa Prefecture, sovereignty is contested by the People's Republic of China (PRC) and Taiwan. This dispute involves historical interpretations, international law, and modern geopolitical tensions that continue to shape relations in East Asia.

Workers at a bonito fisheries factory on Uotsurishima in the Senkaku Islands around 1910.

Key Facts

Current Administration: Japan (as part of Okinawa Prefecture).
Contesting Parties: China (PRC) and Taiwan.
Primary Strategic Value: Fishing grounds, shipping lanes, and potential oil reserves.
Historical Control: The Empire of Japan controlled the islands from 1895 until 1945; the United States administered them post-WWII until transferring them to Japan in 1972.

Historical Context and Claims

The Japanese Position

Japan maintains that it conducted surveys of the islands in the late 19th century and determined they were terra nullius—a Latin term meaning "land belonging to no one." Based on this finding, Japan incorporated the islands into its territory. Japan currently manages the islands through state ownership (such as on Uotsuri and Taisho Islands) and private ownership (such as on Kuba Island), where taxes are levied on owners.

A 1785 Japanese map, the Sangoku Tsūran Zusetsu (三国通覧図説) by Hayashi Shihei adopted the Chinese kanji (釣魚臺 Diaoyutai) to annotate the Senkaku Islands, which were painted red in the same color as all other lands that it did not rule.[11][41] The primary text itself can be found here.[42]

The Chinese and Taiwanese Positions

The PRC and Taiwan argue that historical documentary evidence proves Chinese possession of the islands prior to the First Sino-Japanese War. They contend that the islands were illegally seized by the Empire of Japan and should have been returned following the end of World War II in 1945, alongside other conquered territories.

A significant shift in the dispute occurred in the 1970s. According to researcher Lee Seokwoo, China began actively asserting sovereignty over the islands in the latter half of 1970, following the emergence of evidence suggesting the existence of oil reserves in the surrounding waters.

Qing dynasty in 1820, with provinces in yellow, military governorates and protectorates in light yellow, tributary states in orange.

The Role of the United States

Following World War II, the United States controlled the islands, administering them as part of the Ryukyu Islands. In 1972, the U.S. transferred administration to Japan. In recent years, the U.S. has reaffirmed its commitment to defending Japan under existing security pacts.

ROC Coast Guard vessel and Japan Coast Guard vessel.

Summary of Island Designations and Locations

Comparison of Island Names and Locations
Japanese Name	Chinese Name	Primary Island Groupings
Uotsuri-shima	Diaoyu Dao	Main island
Kuba-shima	Huangwei Yu	Secondary island
Taishō-tō	Chiwei Yu	Tertiary island

Modern Tensions and Incidents

The dispute has frequently escalated into diplomatic protests, maritime confrontations, and demonstrations. These incidents often involve law enforcement actions regarding illegal fishing, patrols by coast guard vessels, and disputes over airspace.

Notable areas of friction include:

Maritime Encounters: Collisions and standoffs between coast guard vessels from different nations.
Airspace Disputes: Tensions arising from the establishment of Air Defense Identification Zones (ADIZ).
Civil Unrest: Demonstrations in cities like Shenzhen regarding sovereignty claims.
Militarization: Increased presence of naval and coast guard assets in the region.

Demonstration in Shenzhen, China on 17 September 2012

East China Sea Air Defense Identification Zones

In a 1969 Atlas published by the Chinese State Bureau of Surveying and Mapping, the islands are shown with their Japanese name "Senkaku Guntō".

Partial image of map showing Senkaku Islands in World Atlas published in China in 1960

Frequently Asked Questions

Why are the Senkaku Islands so important?

The islands are strategically located near major shipping lanes and are surrounded by productive fishing grounds. Additionally, there is the potential for significant oil and gas reserves in the seabed nearby.

When did the dispute become more prominent?

While historical claims exist, the dispute gained significant international attention in the 1970s after evidence of potential oil reserves in the area was discovered.

What is the current administrative status of the islands?

The islands are currently administered by Japan as part of the Okinawa Prefecture, though China and Taiwan continue to claim sovereignty.

How has the United States responded to the dispute?

The United States administered the islands after WWII until 1972 and has since reaffirmed its commitment to the defense of Japan, which includes the islands under dispute.

What are the different names for these islands?

They are known as the Senkaku Islands in Japan, the Diaoyu Islands in China, and the Tiaoyutai Islands in Taiwan.