In this Jan 29, 2019 file photo, US and the Democratic People's Republic of Korea's flags are on display for sale at a flag shop in Hanoi, Vietnam. (HAU DINH / AP)

SEOUL — The United States and the Democratic People's Republic of Korea (DPRK) will meet again this month in an unidentified Asian country ahead of their leaders' planned second summit in Vietnam in late February, the Republic of Korea (ROK)'s officials said Sunday.

The US special representative for DPRK, Stephen Biegun, visited Pyongyang last week to work out details of the Feb 27-28 summit between President Donald Trump and DPRK leader Kim Jong-un.

ROK's national security adviser Chung Eui-yong said a follow-up US-DPRK meeting ahead of the summit will take place in a third country in Asia in the week that begins Feb 17

After being briefed by Biegun about his discussions in the DPRK, ROK's presidential office said that the US and DPRK used Biegun's trip as a chance to explain what concrete steps they want from each other.

READ MORE: ROK anticipates major progress in 2nd DPRK-US summit

ROK's national security adviser Chung Eui-yong, who met Biegun, reported that US-DPRK diplomacy "is working well," presidential spokesman Kim Eui-kyeom said. He said a follow-up US-DPRK meeting ahead of the summit will take place in a third country in Asia in the week that begins Feb 17.

In Pyongyang, Biegun and Kim Hyok-chol, DPRK's special representative for US affairs, discussed "advancing Trump and Kim's Singapore summit commitments of complete denuclearization, transforming US-DPRK relations, and building a lasting peace on the Korean Peninsula," the US State Department said in a statement.

ALSO READ: Hopes high for concrete results from 2nd Kim-Trump summit

Trump and Kim met for their first summit in Singapore last June, during which Kim pledged to work toward the "complete denuclearization" of the Korean Peninsula, without providing a clear timetable or roadmap. US-led diplomacy aimed at getting the DPRK to abandon its nuclear program in return for outside concessions has since made little headway.