Japan lodged an official protest yesterday after three Chinese maritime surveillance vessels entered disputed waters in the East China Sea. Japan's coastguard said the three vessels entered waters around the disputed Diaoyu Islands, known as the Senkakus in Japan.
The Diaoyu Islands are a group of uninhabited islands located roughly due east of mainland China, northeast of Taiwan, west of Okinawa Island, and north of the southwestern end of the Ryukyu Islands. They are currently controlled by Japan, which calls them Senkaku Islands. Both China and Taiwan claim sovereignty over the islands.