Japan plans to strengthen its defense system in the Pacific Ocean as part of the revision of three security-related documents slated to be made by year-end, sources have said.

The government aims to improve the country*s deterrence and response capabilities in light of increasing Chinese military activities in the area. The Defense Ministry has begun examining concrete measures on a full scale at the Pacific defense concept office set up this month.

※A vast area on the Pacific side is a defense vacuum,§ Defense Minister Shinjiro Koizumi told reporters during his visit to Iwoto, the island widely known as Iwo Jima, in the village of Ogasawara, Tokyo.