A Chinese warships sailed near the Pinghu gas field, means the first time in five years in the East China Sea oil fields of China warships, Japan and the United States sent warships to monitor the surrounding area.

Japan's "Sankei Shimbun" reported that 9 of the Chinese frigate ship, at least a week ago in the waters near the East China Sea Pinghu field navigation, the Diaoyu Islands is Japan fishing boat collision occurred, the first time that Chinese warships in the East China Sea oil fields come and go, Since September 2005 is the first time since. Reported that the East China Sea Pinghu oil and gas fields are among the farthest from the center line of the Japanese claim the oil fields, not the object of the Sino-Japanese joint development. Japan Maritime Self Defense Force warships and military vessels equipped with sonar equipment, respectively, to the waters, to monitor trends in the Chinese ships.

        At the same time China and Russia on the Diaoyu Islands and the four northern islands with friction, a little too much for Japan

Two large countries with islands around the same time heating up the dispute, which is obviously too much for some of the Japanese Democratic Party government. Which led to this situation, it is Japan's aggressive in the marine sector in recent years, provocative gesture.