Four Chinese patrol ships entered the waters of the Senkaku Islands, which Japan considers its own, Free NEWs reported with reference to the NHK TV channel.
The report says that the ships remained in the Senkaku area for about an hour and a half, after which they continued to cruise in the adjacent zone.
The Senkaku Islands (Chinese for Diaoyu) are the subject of a territorial dispute between China and Japan. The islands are currently controlled by Tokyo, which states that they have been subject to Japanese jurisdiction since 1895.
China, in turn, claims that on the maps that appeared in Japan in 1783 and 1785, the islands were designated as its territory. After World War II, the islands were under the control of the United States and were transferred to Japan in 1972. In Taiwan and mainland China, it is believed that the Japanese side is holding them illegally.