在12月5日日本聯合防務電話會議上, 日本空中自衛隊負責官員聲稱, 在2013年伊始日本空自隊的F15J就在釣魚島附近海域活動, 測試中國雷達的探測能力, 結論是中國雷達根本無法探查釣魚島附近低空目標. 而日本雷達系統則可以給予釣魚島海域全方位探測能力. 中國雷達僅能發現該地區高空活動的飛行器.

Japan has responded to China's Nov. 23 announcement of its air defense indification zone (ADIZ) over the East China Sea by holding a television conference to discuss the possibility of dealing with China on three fronts — Taiwan, the Miyako waterway and the disputed Diaoyutai (Senkaku or Diaoyu) islands — within the next 10-15 years, according to the Toyko-based Sankei Shimbun.

Commanders from the Japan Air Self Defense (JASDF) Northern Air Defense Force, Central Air Defense Force, Southern Air Defense Force and Southwestern Composite Air Division were called up by the Air Defense Command HQ stationed at Yokota for the television conference on Dec. 5, the paper said.

During the conference, the JASDF said that from the beginning of this year, its F-15J fighters had conducted drills to test the capability of the Chinese radar system.

The JASDF concluded that Chinese radar system is able to detect the movement of aircraft in high altitude only.

Commanders attending the conference pointed out that the Japanese early warning radar system in Kyoto prefecture — based in the western part of the nation — can cover the entire airspace over the disputed Diaoyutai islands, which Japan, China and Taiwan all lay claim to (called the Senkaku Islands in Japan and the Diaoyu Islands in China). It can also cover the Miyako waterway, which lies between the Japanese islands of Miyako and Okinawa, and is thus an advantage in a potential conflict against China and its military aircraft.

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