North Korean leader Kim Jong Un warned again this week that the North could preemptively use its nuclear weapons if threatened.

North Korea said Friday it test-fired a new anti-aircraft missile, the fourth weapons launch in recent weeks.

North Korean leader Kim Jong Un vowed to bolster his nuclear forces at “maximum speed” and threatened to use them if provoked in a speech he delivered during a military parade that featured powerful weapons systems targeting the United States and its allies.