DPRK supreme leader Kim Jung Un has left Vietnam by train after a two-day official visit. Chairman Kim held a series of meetings with Vietnamese leaders. According to the DPRK's state media KRT, Kim told Vietnamese President Nguyen Phu Trong that the two countries should normalize cooperation in the economy, science, technology, and defense. He also visited the Mausoleum of Ho Chi Minh to pay tribute to Vietnam's late leader. The official visit followed Kim's summit with US President Donald Trump. That meeting ended early due to a disagreement over the next steps in the denuclearization on the Korean Peninsula and lifting sanctions. Here's more now on the DPRK leader's Vietnam visit.

Kim Jung Un presents a wreath at the Mausoleum of Ho Chi Minh, the father of modern Vietnam. It was one of several ceremonial activities during his State visit to Vietnam, the first for a DPRK leader since his grandfather in 1964. And a moment of remembrance for Koreans who died in the Vietnam War.

Meetings with the President and Prime Minister are thought to have focused on economic issues. The DPRK is keen to follow a Vietnamese model in reforming its economy and increasing trade. So I asked one of the reformers who reshaped Vietnam's economy in the 1980's what advice he'd been giving to the DPRK.

PROFESSOR LE DANG DOANH ECONOMIST "I have made presentations and explained to them how to implement the freedom to do business according to law, how to develop the private sector, and very importantly how to be integrated into the world economy."

Tony Cheng: Do you think its possible at this stage for the DPRK to open up like Vietnam has and to enjoy this sort of success?

Prof Le: I think it's up to Pyongyang because the war ended in 1953 and it's a very long time already.

But with his official duties dispensed, Kim Jung Un was heading back home. A State visit is a rare thing for the DPRK leader, and on this occasion, events were overshadowed by the breakdown of talks with Donald Trump.