Wars between great powers are won and lost on manufacturing base. The classic book on this topic is https://en.wikipedia.org/wiki/The_Rise_and_Fall_of_the_Great...
https://walton.uark.edu/clc/posts/when-supply-chain-is-the-b...
Would Russia/China/US not use their nukes if in risk of being overrun by conventional forces of another superpower?
but there's really no winning when the enemy can put more planes, tanks, guns, boats and troops than you by a large factor, if they are even somewhat competent at using them.