Yep, I think Vietnam is exactly where it wants to be - it's had the leaders of the US, China, and Russia visit in the space of about 9 months and they all have their own reasons for keeping it friendly.
I can't see Vietnam turning its back on Russia but neither can I see it doing much to support the country in its war in Ukraine, Vietnam's trade ties with Russia are insignificant compared to its trade with the US, which it is also seeking to keep on side as a balance to China's territorial claims in the South China Sea.
I think looking at Vietnam's relations with the West through the prism of the Vietnam War is a mistake - the war ended 50 years ago and only old people remember it, there's also been a war with China fought in the meantime. The Vietnamese population is relatively youthful so the war is probably even less relevant for people in Vietnam dealing with America today than the Second World War was for people in Britain dealing with Germany in the 1990s.