The US envoy for North Korea has returned from Pyongyang.
Stephen Biegun had was there to hold talks in preparation for a second US-North Korean leadership summit.
After three days in discussions, US officials said Biegun would meet his counterpart again soon.
US President Donald Trump recently confirmed that he would meet North Korea's Kim Jong-un in Vietnam, on 27-28 February.

US Epstein files release highlights Clinton, makes scant reference to Trump
Bangladesh holds state funeral for slain youth leader amid tight security
US hits ISIS in Syria with large retaliatory strikes, officials say
Pakistan court hands Imran Khan, wife 17-year jail terms in another graft case
