Our concerns were that they should never have been in Vietnam in the first place. We, the allies, did a deal with the freedom fighters during WW2, we asked them to fight the japs to stop or hinder their advance through that part of the world. In return, we promised them independance from France, a cruel occupier, and free elections. They fought and died on our side, 1000's of them. We then reneged on the deal. They then fought for what was rightfully theirs. The US excuse was "The Domino Effect", what happened to that?
As for Cambodia, the US bombing of that country, denied for many years, caused the instability that allowed Pol Pot to do what he did. And who was it that finally stopped him and saved the country? Vietnam.
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