North Korean leader Kim Jong-un left Vietnam on Saturday, a few hours earlier than originally scheduled after failing to produce a deal during his talks with U.S. President Donald Trump.
The North Korean leader boarded his personal train in the Vietnamese border town of Dong Dang at around 3 p.m. Korea time.
Ahead of his departure, Kim dropped by the Ho Chi Minh Mausoleum to pay his respects, as his late grandfather Kim Il-sung shared close personal ties with the former Vietnamese leader.
It remains unknown at this time which route Kim is taking on his trip back to Pyeongyang.
If he decides to go straight back to North Korea, the journey will take some 3,800 kilometers and at least two-and-a-half days.
There is speculation that he could stop by the Chinese city of Guangzhou, an area known for its reform efforts and rapid economic development.
He could also visit Beijing to discuss the results of the Hanoi summit with Chinese President Xi Jinping, but nothing has been confirmed.
Kim and President Trump held their second summit in Hanoi from Wednesday to Thursday to negotiate a deal on denuclearization, but the talks broke down as both sides couldn't meet each other's demands.
With the latest trip, Kim Jong-un became the first North Korean leader to visit Vietnam in 55 years, after North Korea's founding leader Kim Il-sung traveled to the country in 1964.
Kim Mok-yeon, Arirang News.