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.

Death toll from Venezuela earthquakes rises to around 235
Japan braces for double storms, torrential rains shut down parts of Taiwan
Australia pledges tougher enforcement of social media ban for teens
GCC-US talks emphasise regional security, lasting peace
UN agency pauses Hormuz ship evacuation after vessel attacked
