Pompeo urges North Korea's Kim to follow Vietnam's example

Pompeo points to Vietnam as example of improved relations

I think in general, Vietnam (also China) is one of the communist countries have positive influence on the rest (Venezuela, NK..?). I don't think Kim mind what Mike said though.

Chinese officials tout ‘made in Vietnam’ zones on border amid trade row with US

Our Mong Cai and Langson (next to PingXiang) are still bustling with China.

Xiong’s most pressing task is to line up meetings with senior cadres on the other side of the border in Cao Bang province, to make sure they stay committed to the plan. He will start with the offer of 100 Chinese manufacturers setting up on the Vietnamese side of the zone, where their initial investment will allow construction to begin.

=> But in my opinion, next few years Cao Bang will be even greater than Mong Cai (QuangNinh) and Lang Son.