Japan has carried out its first submarine drill in the South China Sea, local media said on Monday, a move that could provoke Beijing which claims most of the disputed waters.
The anti-submarine drill was conducted on Thursday in the region to "improve strategic techniques", Japan's defence ministry said in a short statement.
Prime Minister Shinzo Abe defended the drill, which he said does not aim to target "a particular nation." Neither Abe nor a ministry spokesman said whether it was the first such exercise there.
The Asahi Shimbun newspaper said the submarine Kuroshio joined three Japanese warships in waters just southwest of the China-controlled Scarborough Shoal.
China claims most of the resource-rich South China Sea, through which USD 5 trillion in shipping trade passes annually, despite competing claims from Brunei, Malaysia, the Philippines, Taiwan and Vietnam. Tensions have been high over the Scarborough Shoal since Beijing seized it from Manila in 2012.
The newspaper said the one-day submarine exercises were Tokyo's first in the South China Sea.
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The Maritime Self-Defence Force carried out a "practical" anti-submarine drill, including an exercise to spot enemy submarines with sonar devices, the Asahi said, quoting government sources.
The sources described it as a legitimate naval exercise in neutral waters, with rights of access under international law.
Abe stressed that he agreed with Chinese President Xi Jinping earlier this month that he will visit Beijing soon, saying Japan-China relations have entered "a new stage."