I would say that immediately after the end of the war, the Vietnamese Communist Party did enjoy much influence, if not control, for a long period of time over the two neighbouring countries of Laos and Cambodia. But by my assessment, Cambodia is slipping away from their control. Laos is still pretty much heavily influenced by the Vietnamese government. Why? I think part of the reason is because China has also been investing a lot in Cambodia, and I have noticed that the Chinese influence in Cambodia has been growing significantly. That could be part of the reason that it has been pulled away gradually from Vietnam. The Vietnamese presence in business and workers, the Vietnamese influence over the Cambodian society, I've noticed over the last five to 10 years, has dramatically declined, but not so much in Laos.
On April 21st, 2015. See this statement in context.