Three Chinese patrol ships entered a Japanese-controlled disputed territory known as the Senkaku Islands in Japan and the Diaoyu Islands in China, Japan's Coast Guard announced on Sunday.
According to Japanese news channel NHK, this is the fifth time that Chinese vessels entered the territory so far in 2015.
China's State Oceanic Administration announced on Monday that it maintained regular patrols in the waters surrounding the islands in 2014 and plans to enhance patrols in 2015.
© SputnikChina – Japan Dispute over Senkaku Islands
China – Japan Dispute over Senkaku Islands
© Sputnik