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UN Commission on the Limits of the Continental Shelf considers the scientific validity of China's claim that a disputed chain of islands in the East China Sea is part of its territory.
Japan has opposed the international body's involvement in the dispute. "There is no doubt that the Senkaku Islands are an inherent part of the territory of Japan in light of historical facts and based upon international law. The Senkaku Islands are under the valid control of Japan," UN Japan's mission said, adding that China's submission to the commission should not be considered.
The tensions between the two countries flared in September 2012, when Japan's government purchased the islands from a private Japanese owner.
The chain of islands, referred to as the Senkaku Islands by Japan and the Diaoyu Islands by China, lies between Taiwan and Okinawa, near potentially rich gas reserves.