This is what people should understand, we don't want to see Russia and the United States ever go to a real full-scale war -- if this was to ever be the case the world would be obliterated as we know it.
Though we shouldn't underestimate the ability of proxy wars, as we are having proxy wars around the world as of right now -- as these two nations would never actually go to war against one another but they're going to use other nations in between them.
If we were ever to see the two of them go toe to toe, the US would remove them from the earth. The US has the tech, the capacity, and the willpower to win all of this out. Though we only know so much of what the capacity of some of these nations REALLY are (as there is covert stuff)