It'd be the US kicking everyone elses shit in, until the British and French let the nukes fly,
I hate to break it to you but the US is multitudes more powerful than the rest of NATO, NATO can still burn the US, but they'll burn with it. Same goes for Russia.
conventionally, the US is the world hegemon as far as naval and air power goes, they are unbeatable.
what the US doesn't have the stomach for , is occupation. they were defeated by mountain men with 70 year old Kalashnikovs on the other side of the world, who were so culturally different from them they might as well have been aliens, Just imagine what it'd be like against an enemy on your doorstep that looks and talks just like you. that you cant tell from your own. Wait, you dont' even need to imagine, because it already happened, Look at how Russia's occupation was torn apart by the Ukrainian resistance. The only way they ever secure land is by bombing it to dust and moving in.
and unlike Russia, America has a formidable faction within its own borders who would revolt and start a civil war if the Trump/MAGA administration became hostile to America's friends and allies.