REPUBLIKA.CO.ID, TOKYO -- Three Chinese ships sailed through disputed waters off Tokyo-controlled islands in the East China Sea on Sunday, the Japanese coastguard said, the first time since Beijing announced an Air Defence Identification Zone over the sea.

The vessels entered the 12-nautical-mile territorial waters at about 9:00 am (0000 GMT) off one of the Senkaku islands, which China also claims and calls the Diaoyus, the Japan Coast Guard said.

This is the first time that Chinese coastguard ships were spotted sailing through the waters after Beijing raised regional tensions with its declaration of the air zone on November 23.

Chinese vessels have sailed in and out of the contiguous waters around the islands but stayed away from entering their territorial waters since November 22, a Japanese coastguard official said.

Japan's conservative Prime Minister Shinzo Abe has vowed no compromise on sovereignty of the islands and stepped up defense spending, believing that China is trying to change the status quo through growing sea incursions.

Chinese state-owned ships and aircraft have approached the Senkakus on and off to demonstrate Beijing's territorial claims, especially after Japan nationalized some of the islands in September last year.

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