Beijing, April 10 (CNA) Four Chinese coast guard vessels sailed into waters around the disputed Diaoyu Islands, called Diaoyutai Islands in Taiwan, in the East China Sea on Monday, according to a statement on the official website of China's State Oceanic Administration.
The boats were patrolling in an area Beijing considers part of its territorial waters, the statement said.
It was the ninth time this year that Chinese coast guard has patrolled the area, which is claimed by China, Taiwan and Japan.
Known as the Senkaku Islands in Japan, the uninhabited island group is currently controlled by Japan.
Japan's move in September 2012 to claim three islets in the disputed island group as part of its national territory ignited disputes over sovereignty among Taipei, Beijing and Tokyo.
Since then, Chinese coast guard vessels have often sailed into the waters off Diaoyutai and even into what Beijing calls "territorial waters," 12 nautical miles around the island group, confronting Japanese patrol vessels.
(By Lawrence Chiu and Elizabeth Hsu)