China ships in disputed waters, says Japan coastguard
This picture taken by Japan Coast Guard on December 12, 2012 shows a Chinese fishing patrol ship cruising near a group of disputed islands known as the Senkakus in Japan and the Diaoyus in China in the East China Sea - by Japan Coast Guard
The Chinese vessels entered the 12-nautical-mile territorial waters off one of the Senkakus, which China claims and calls the Diaoyus, at around 9:00am (0000 GMT) and left the area around two hours later, the Japan Coast Guard said.
It was the fifth time this year that state-owned Chinese ships entered the zone and the first foray in six days.
China's State Oceanic Administration said on its website: "On February 23rd, China's coastguard ships 2151, 2113 and 2102 patrolled together into territorial waters surrounding China's Diaoyu islands".
Chinese vessels and aircraft have regularly approached the East China Sea archipelago -- thought to harbour vast natural resources -- after Japan nationalised some of the islands in September 2012, setting off the latest spate of incidents in a long-running territorial dispute.
Fears of conflict rose in November when China imposed an air defence identification zone (ADIZ) over the East China Sea and said it required notification from planes crossing the area.
Washington was angered by the move, saying it could lead to confusion in the skies.
US Secretary of State John Kerry has warned Beijing against unilateral moves to set up a similar air defence zone over the South China Sea, where the Philippines in particular has voiced worries about China's maritime claims.
Earlier this month, the top US diplomat said the United States would defend Japan against attack including over the disputed islands in the East China Sea.
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