DefenseWhite paper to cite Chinese radar incident and detail North Korean developmentsA new Japanese Defense Ministry white paper will mention an incident when Chinese jets locked radar onto an Air Self-Defense Force aircraft last year. (Photo by Kosuke Imamura)RYOTA OGATAJune 10, 2026 07:19 JSTTOKYO -- Japan's Defense Ministry is expected to designate China as Japan's most serious concern in the ministry's annual white paper, Nikkei has learned, while committing to deeper cooperation with the U.S. and like-minded nations to enhance capabilities for deterrence.