Chinese coast guard vessels sailed near disputed islands claimed by Japan and China in the East China Sea on Monday, marking the second such incident in less than a week.
The four ships entered the waters surrounding the island chain, controlled by Japan and known as Senkaku in Japanese and Diaoyu in China, at around 10:00 am (0100 GMT) and were moving in a southwest direction, according to the Japanese coast guard.
An online statement from China's State Oceanic Administration only said the four Chinese coast guard vessels were "patrolling in Chinese waters off the Diaoyu Islands."
Japan's coast guard said it was the second time since Thursday that four Chinese ships had entered its waters.
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