North Korea said on Saturday its nuclear weapons are not meant for negotiations but are intended for combat use against enemies that threaten its people and world peace, its state media reported.

Kim Jong-un’s comments on Washington’s regional moves are a hint at a precondition for a fourth summit between him and Trump, analysts say.

The US president floated the idea of helping develop a coastal resort in North Korea in exchange for denuclearisation.

North Korean leader Kim Jong Un has vowed to bolster his nuclear weapons program in response to the U.S.’s enhanced security partnership with South Korea and Japan. Last year, the U.S. expanded bilateral military exercises with South Korean and trilateral training with South Korea and Japan.

Leader Kim Jong Un pledged to pursue "sustained countermeasures," citing security ties between the U.S. and its regional allies.