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.

Sudan's RSF agrees to US proposal for humanitarian ceasefire
India top court says Air India crash report does not insinuate anything against pilot
Explosion at mosque in Indonesian capital injures 54 people
Over 200 flights delayed at Delhi airport after glitch in air traffic system
Typhoon Kalmaegi hits Vietnam as death toll nears 200 in Philippines
