North Korea is committed to closing the door on 70 years of war and hostility with the destruction of plutonium and uranium sites, according to US Special Envoy for North Korea Stephen Biegun.

The US and North Korean governments must first reach an agreement on expert access and the mapping and monitoring of key sites before North Korea can achieve full denuclearisation.

The recent development comes after the US government eased its demands for humanitarian aid despite warnings of a potential food crisis after sanctions and drought ravaged the North Korean economy.