Russia is losing a conventional war in Ukraine, against Ukraine.

They would lose a conventional war to the US much faster.

Nukes against Nukes? Russia loses again. But no one would be around for a victory parade, maybe.

The US has a larger, more modern nuclear triad than Russia. So if Russia launches their weapons, US launches their weapons. Germany launches their weapons. France launches their weapons. UK launches their weapons.

Who wins in that exchange? China and India.