Modern warfare is multi-dimensional. Military might alone is not sufficient to ensure victory. The theatre of war include trade, education, popular entertainment, sports, basically an "all of society approach".

The winner will be the one with the greatest resolve. 

The USA is not known to have great resolve. 

We saw how they lost the Vietnam War and the War on Terror in Afghanistan. 

With the current war in Ukraine, Russia will prevail if the USA and NATO lose their will to fight. They have little to start with.