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A Chinese government ship briefly entered territorial waters off Japanese-controlled but disputed islands in the East China Sea on Thursday, Japan's coastguard said.
The fishery patrol boat entered the 12-nautical mile zone off Kubajima, one of the Senkaku islands, at about 3:36 pm (0636 GMT), according to a statement.
It added that the ship moved out of the zone after 22 minutes, watched by a Japanese coastguard vessel.
Beijing claims the islands, which it calls the Diaoyus.
The incident was the latest in a series, with Japan claiming that in one case Chinese vessels locked weapons-targeting radar onto a ship and a helicopter. Beijing denied the charge.
The incident on Thursday came as Japan's hawkish Premier Shinzo Abe, who swept national elections in December, heads to Washington for talks with US President Barack Obama.
In an interview with The Washington Post before the trip, Abe said a tighter alliance with the United States would send a message to Beijing in the tense row over the disputed territory.
The dispute between Asia's two largest economies intensified in September when Tokyo nationalised three islands in the chain, in what it said was a mere administrative change of ownership.