Since taking office in a snap election in June, the liberal Lee has taken steps to lower tensions with the nuclear-armed North, and the issue is one where he is expected to find common ground with Trump, who still boasts of his historic summits with North Korean leader Kim Jong Un.

A Chinese national has been sentenced to eight years in prison for smuggling firearms and other military items to North Korea, the US justice department said. Shenghua Wen, 42, received around $2m (£1.5m) from North Korean officials to ship the items from California, according to a statement from the agency on Monday.