Japanese Coast Guard vessels fired water cannon to turn away about 40 Taiwan fishing boats and eight Taiwan Coast Guard vessels today.
They are trying to turn them away from waters Japan considers its own and the incident comes at a time when hostility is high between Tokyo and Beijing.
Japan protested to Taiwan, a day after it lodged a complaint with China over what it said was a similar intrusion by Chinese boats.
Sino-Japanese relations deteriorated sharply this month after Japan bought disputed islands in the East China Sea, sparking anti-Japan protests across China.
Taiwan has friendly ties with Japan, but the two countries have long squabbled over fishing rights in the area. China and Taiwan both argue they have inherited China's historic sovereignty over the islands.

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