Three Chinese coastguard ships today entered disputed waters near East China Sea islands at the centre of a bitter row with Tokyo, Japanese officials said.

The vessels sailed into the 12-nautical-mile band around the Tokyo-controlled Senkaku islands — which Beijing calls the Diaoyus — at around 0030 GMT, the Japanese coastguard said.

The incursion came a day after Japan’s defence minister said Tokyo could be a key participant if conflict breaks out in Asia as he warned China was seeking to exploit difficulties between allies.

It was the latest in a series of forays by Chinese ships in a year-long spat between Tokyo and Beijing that has sent relations plummeting.

The islands — believed to harbour vast natural resources below their seabed — are seen as a potential flashpoint that some observers fear could lead to armed conflict between the Asian giants.

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