The U.S. State Department says the U.S. special envoy for North Korea,... Stephen Biegun left for Hanoi on Tuesday,... to prepare for next week's summit between the two countries' leaders.
This comes as North Korea's Special Representative for U.S. Affairs, Kim Hyok-chol, is also on his way to the Vietnamese capital.
The working-level North Korean official and his delegates are reportedly in Beijing for a stop-over.
Kim Hyok-chol is joined by Choe Kang-il, North Korea's Deputy Director-General for North American affairs and Kim Song-hye, head of North Korea's United Front Department.
The two sides are expected to discuss what concrete denuclearization steps the North is willing to take,... and what the U.S. will offer in return.
They will also discuss the logistics and protocol of the summit.