No. I don't think that's "winning". First of all Russia is more than just Putin. Actual people live there. As much as in Ukraine. They wouldn't be that much better than Russia if Ukraine "invaded" Russia back. Also for that to happen the west would need to support Ukraine so dramatically that it most certainly would come to a nuclear Supergau. This "total annihilation of Russia" would mean in return the total annihilation of the human race.

I don't think Ukraine can "win" against Russia with sheer military might. No matter how much they are supported. That's an archaic view of politics and war. The only real solution to bring piece is a peace contract. It isn't the 11th century anymore where two armies would clash against each other and the one coming out victorious is the winning party of the war. I'm not one of those "stop giving Ukraine weapons and military aid und jUsT tAlK wItH pUtIn" guys but in the end there has to be a treaty. And you can't do that by just bombing the shit out of Russia cuz that'd mean the end of the fucking world.