North Korea says it is only a matter of time before Japan revises its constitution for the worst through the support of its military alliance with the United States.

Radio Pyongyang on Thursday cited Japan's move of combining its Self-Defense Force with the U.S. Army and placing the headquarters of an SDF prompt action unit on the U.S. Jama Base in Kanagawa.

The broadcast also blasted Japan for supporting the U.S.-led war on terror as a way to realize its imperialist ambition, saying Tokyo will legitimize the invasion of other countries in a constitutional revision in the near future.