Vietnam foreign minister visits North Korea
No further details of his schedule have been released by his North Korean hosts.
Vietnam's capital, Hanoi, is to host the summit between Trump and Kim on February 27-28.
N Korea, Vietnam foreign ministers meet ahead of Trump-Kim summit
Pyongyang: Vietnam's foreign minister has arrived in North Korea ahead of a planned summit between US President Donald Trump and North Korean leader Kim Jong Un in Vietnam's capital later this month.
Vietnam foreign minister visits North Korea
The two leaders held their first summit last June in Singapore.
Also Read: Iraqi IS fighters to be held in Iraqi camps
The United States is hoping to get a firm commitment on denuclearization from Kim.