South Korean President Moon Jae-in pushes back against widespread skepticism about the sincerity of Kim Jong Un’s vows to give up his nuclear bombs.

North Korean officials have warned in a letter to the United States that denuclearisation talks were "again at stake and may fall apart", CNN reports, citing people familiar with the matter.

US President Donald Trump on Monday urges China to maintain tight control of its border with North Korea until he signs a denuclearization deal with Kim Jong Un.

North Korean officials have told their US counterparts that Kim Jong Un is ready to discuss denuclearisation, an assurance that could pave the way for a planned meeting with President Donald Trump, reports say.