All your words just want to belittle China's help in anti-France war, however, the history clearly shows that Võ Nguyên's five divisions all armed and equipped by us in battle of Vĩnh Yên, while your beloved American help is vague and hard to validate, on the other hand, how their killing and helping to kill Vietnamese are memoried by France foreverWhat attitude? The Cambodian is cautious, why should we try to unnerve them? After the 1979 war you don't think VN wasn't cautious when dealing with China?
I am talking about the early state of VN-France war. Viet Minh received some US small arms and training from US specialists. Everybody know that France after WW2 didn't want to join US alliance, even came as far as refused US aid for rebuilding the country. Of course US was not fond of France either. Later when France stuck in VN war, it used all the help it could get, including the US. So the US see France > Vietnam so it abandoned VN to Chinese and Soviet arms.
And answer my questions, if you don't mind. Or else you won't even know why we are argueing in the first place?
So for your answer, history clearly showed that Vietnam is in the North of Champa, so go where you ever go and return Kampuchea Krom to Cambodia and also Phu Quoc island.