"My representatives have just left North Korea (DPRK) after a very productive meeting and an agreed upon time and date for the second Summit with Kim Jong-un. It will take place in Hanoi, Vietnam, on February 27 & 28," Trump said on Twitter.

Earlier in the day, the State Department said in a statement that during his stay in the DPRK, US special envoy for DPRK-related issues of Stephen Biegun had "met with Special Representative for US Affairs of the State Affairs Commission of the DPRK Kim Hyok Chol February 6-8, in Pyongyang."

The two officials "discussed advancing President Trump and Chairman Kim's Singapore summit commitments of complete denuclearization, transforming US-DPRK relations, and building a lasting peace on the Korean Peninsula," the statement read.

It added that they "agreed to meet again in advance of President Trump and Chairman Kim's second summit."