SEOUL/WASHINGTON • At last week's summit with South Korean President Moon Jae-in, North Korean leader Kim Jong Un promised to allow outside inspections on key missile facilities and expressed a willingness, for the first time, to "permanently" scrap North Korea's main nuclear complex.

While these are positive first steps, experts say they would do little to damage the country's larger nuclear and missile capabilities, or to demonstrate whether Mr Kim is serious about giving up his nuclear arsenal.