The United States and North Korea have entered final working-level negotiations ahead of their second bilateral summit set to open in Vietnam next Wednesday. 

A North Korean delegation led by special representative for U.S. affairs Kim Hyok-chol visited the venue where U.S. officials were staying in Hanoi around 3:30 on Thursday. 

It was the first time in two weeks he sat down for talks with U.S. Special Representative for North Korea Stephen Biegun since the American envoy's three-day visit to Pyongyang earlier this month. 

They are expected to finalize the summit agenda, including denuclearization steps by the North and corresponding measures by the U.S., and produce a draft of the agreements to be announced by the leaders of the two countries at the end of the two-day summit. 

Biegun is known to have arrived at Noi Bai International Airport in Hanoi at around 8 a.m. on Thursday, around 12 hours after Kim landed at the airport.