US envoy Biegun arrives in Pyongyang
The US envoy for North Korea is in Pyongyang for talks, paving way for a second leadership summit.
Mr Biegun arrived just as US President Donald Trump confirmed he would meet North Korea’s Kim Jong-un in Vietnam on 27 February.
The two leaders will build on the vague denuclearization commitments they made when they met in Singapore last June.
Meanwhile, the UN has warned that North Korea is continuing its nuclear programme and breaking sanctions.