How about open the gate to China and negotiate an end to our war in Viet Nam for starters?
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China is more of a threat than Russia now and we lost Viet Nam and let them go communist, let Pol Pot arise in Cambodia, etc. Not saying Nixon didn’t do the right thing in both cases, I was a kid then and don’t know how limited his options were, but opening to China and surrender in Viet Nam are not clear victories given hindsight.
Nixon inherited a lost war against which the American people had already turned. The Paris Peace Accords got us out with at least the semblance of dignity. It was two years after our last troops left that RVN fell, and it was because of a chicken-shit US Congress, not Nixon.