Japan has accused a Chinese spy plane of breaching its airspace, in what would be the first known time that a Chinese plane has directly violated Japanese airspace.
Japan scrambled fighter jets after a Y-9 surveillance plane "violated the territorial airspace" of Danjo islands at 11:29 local time Monday (02:29 GMT).
Japan's Chief Cabinet Secretary called the breach "utterly unacceptable" and summoned a Chinese embassy official in Tokyo in protest.
The incident comes as tensions rise in the region, where China competes for influence against the US and its allies, including Japan.
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Japan has also recently flagged the presence of Chinese ships in the Senkaku islands in the East China Sea, which is claimed by China and which Beijing calls the Diaoyus.
China has become increasingly assertive in the region, in its claims over Taiwan as well as the South China Sea.
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