As part of efforts to revamp the national defense strategy, Defense Agency officials have established three scenarios in which China attacks Japan.

The scenarios involve attacks stemming from disputes over ocean resources and claims over the Senkaku Islands as well as a clash across the Taiwan Strait, agency sources said Sunday.

While the scenarios are for discussions on Japan's future defense capabilities, they indicate the perceived threat China poses and will probably further upset Beijing amid the ongoing political standoff over the development of gas fields in the East China Sea and the dispute over the Senkaku Islands.