China has sent patrol ships near several islands in the East China Sea that Japan claims to have purchased.
The ships had reached waters near the islands - known as Senkaku in Japan and Diaoyu in China - to "assert the country's sovereignty", Xinhua said.
Japan confirmed on Tuesday it had signed a contract to buy three of the islands from their private owner.

Japan confirmed on Tuesday it had signed a contract to buy three of the islands from their private owner.
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