The Defense Agency has prepared a plan to defend the southern remote islands off Kyushu and Okinawa from possible invasion amid rising security concerns about China, according to documents obtained Saturday by Kyodo News.

The agency compiled the plan in November on the assumption of an invasion of the islands located within a 1,000-km zone between the southern end of Kyushu and Taiwan.

Thousands of islands are scattered in the area. The Senkaku Islands, claimed by both Japan and China, are among them.