Airstrip One
Completely Effed
WM is correct, though. The UN would not be allowed to attack the US because we would veto it. Now, Russia and China could get together and attack the US, although I doubt they could really work together. Both distrusts the other, and they have regional disputes (such as everyone laying claim to the Pacific islands that are all under dispute).
That said, China and Russia don't have air or naval power on par with the US...
That said, China and Russia don't have air or naval power on par with the US...