NATO forces vastly outnumber the Russians and NATO equipment is superior to Russian equipment as well. The quality of NATO personnel is superior too. One benefit of a volunteer military is motivation. I spent roughly two years as OIC (officer in charge) of all Infantry ranges at the largest live fire training facility in Europe, at Grafenwoehr, Germany. Even amongst first rate militaries, conscripted militaries lag behind volunteer forces - mostly because of the motivation of personnel.

A big thing is “power projection”. Russia essentially has none of those capabilities once it gets far beyond its borders, as is demonstrated by their inability to support their current assault on Ukraine (which it even shares a border with).

Launching nukes is the only thing that worries me, but selfishly my kids and I live close enough to a major manufacturing center that’d we’d be killed by the first salvo. We wouldn’t even know the war had begun.

Even if China allied with Russia, it’d still be no contest. Like Russia, China doesn’t have the ability to deploy much of its military power significantly beyond its borders. The Korean Peninsula would be a mess, but to attack Taiwan and Japan, forces would need to conduct an amphibious landing, at which point our superior naval power would come into play.

I believe because of economic reasons alone we’d never see a war with China.