China, does no war games and would be an absolute disaster. Their numbers would be meaningless.
Russia is behind as well. The U.S. is unstoppable.
That is exactly what the Germans thought when they attacked Russia with vastly superior numbers and weapons. They lost in spectacular fashion. Russian tanks were very basic but ideal in the conditions, but also repairable in the field by their own crews, who had built them. Russians like the Turks and Afghans have always been hard to conquer.
No one knows how the modern Fleet, based on Aircraft carriers, will cope against modern weaponry, as they have never been tested. It is likely that they will be susceptible to guided missiles from submarines and space. I suspect that in the event of a major war, they would be withdrawn to port like the giant battleships were. Their major use is supporting local firefights.
It seems Trump intends to reduce Americas role as an international police force, That is what he has said anyway.
However the American forces are balanced and armed for exactly that role. So it would be far less effective in a major war situation against Russia or China.