Tokyo summoned China's envoy in protest at what it says was another incursion into its territorial waters, after Beijing's ships sailed near islands at the centre of a bitter dispute.
This handout picture taken by the Japan Coast Guard on February 4, 2013 shows a Chinese marine surveillance ship (L) alongside a Japan Coast Guard vessel near disputed islands. Tokyo has summoned China's envoy in protest after what it says was another territorial incursion.
"The foreign ministry summoned the Chinese ambassador over ships entering the waters near Senkaku islands," said an official, referring to a chain claimed as the Diaoyus by Beijing.
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