The Senkaku Islands(尖閣諸島,Senkaku-shotō, variants: 尖閣群島 Senkaku-guntō and 尖閣列島 Senkaku-rettō) are a group of uninhabited islands controlled by Japan in the East China Sea. They are located roughly due east of Mainland China, northeast of Taiwan, west of Okinawa Island, and north of the southwestern end of the Ryukyu Islands.
Following the discovery of potential undersea oil reserves in 1968 in the area and the 1971 transfer of administrative control of the islands from the United States to Japan, the latter's sovereignty over the territory is disputed by both the People's Republic of China (PRC) and the Republic of China (also known as Taiwan).
China claims the discovery and ownership of the islands from the 14th century, while Japan had ownership of the islands from 1895 until its surrender at the end of World War II. The United States administered the islands as part of the United States Civil Administration of the Ryukyu Islands from 1945 until 1972, when the islands returned to Japanese control under the Okinawa Reversion Agreement between the United States and Japan.
China has increased military activity near Taiwan, which it claims as its own, and spent a record 355 days in 2023 patrolling waters near the SenkakuIslands, administered by Japan but also claimed by China and Taiwan.
More specifically, the statement pledged “strong opposition to any action that seeks to undermine Japan’s longstanding and peaceful administration of the SenkakuIslands,” the uninhabited cluster long claimed by China but held by Japan.
Japan on Wednesday lodged a protest with China through a diplomatic channel after four Chinese coast guard ships were spotted entering Japanese territorial waters around the SenkakuIslands in the East China Sea, calling the incident "unacceptable."
As noted by Katsuhisa Furukawa in an April 2021 for OpenNuclearNetwork, Japan could utilize hypersonic weapons to breach enemy defenses during a possible invasion of its remote islands, particularly in the SenkakuIslands contested with China.
... and Security applies to the SenkakuIslands, and reiterated their strong opposition to any action that seeks to undermine Japan's longstanding and peaceful administration of the Senkaku Islands.
Following the call, which lasted about 40 minutes, Nakatani said they agreed the Japanese-controlled SenkakuIslands in the East China Sea fall under the scope of Article 5 of the Japan-U.S.