Associated Press By CHRISTOPHER BODEEN

In this Oct. 13, 2011 file photo, Japan Maritime Self-Defense Force's P-3C Orion surveillance plane flies over the disputed islands in the East China Sea, called the Senkaku in Japan and Diaoyu in China. China said Friday, Jan. 24, 2014, it has begun issuing warnings to foreign military planes entering its self-declared air defense zone over the East China Sea, showing its determination to enforce a measure blamed for stoking tensions in the region, especially with Japan. (AP Photo/Kyodo News, File)
BEIJING (AP) — China said Friday it has begun issuing warnings to foreign military planes entering its self-declared air defense zone over the East China Sea amid heightened tensions with its neighbors, especially Japan.
Chinese state media quoted air force spokesman Shen Jinke as saying several kinds of Chinese planes recently patrolled the sweeping zone that was declared in November. He said the planes identified several foreign military aircraft, flew alongside them and issued them warnings. He didn't identify the planes or say when the patrol was conducted.
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