Will Vietnam Be America’s Next Strategic Partner?

[etylo]

Did the 1968 incident actually happened, if so why did it take 1 year for the PLA to retaliate? Why is there no diplomacy in this issue?
Why did the PLA have to invade Soviet island to ambush Soviet troops?
Who were the chinese killed?

It's Chinese territory island on the Chinese side according to the demarcation of border based on the main pathway of the river. You are a biased Viet now with some twisted facts about China.