North Korean leader Kim Jong Un said a U.S.-South Korea joint military exercise could "ignite a war" and called for the rapid expansion of Pyongyang's nuclear capabilities.

North Korean leader Kim Jong Un supervised the test-firing of two types of new antiair missiles, state media said Sunday, displaying his expanding military capabilities as the South Korean and U.S. militaries carry out joint drills.

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," state media KCNA reported on Tuesday.