Kim said the "security environment" around North Korea is "getting more serious day by day" and "requires us to make a radical and swift change in the existing military theory and practice and rapid expansion of nuclearization," the official Rodong Sinmun newspaper reported, paraphrasing his remarks.

By Ju-min Park and Joyce Lee SEOUL (Reuters) -North Korean leader Kim Jong Un said his country needed to rapidly expand its nuclear armament and called U.S.-South Korea military exercises an "obvious expression of their will to provoke war,

North Korean leader Kim Jong Un has criticized a joint military exercise by the United States and South Korea, saying it shows