The most important thing that can happen right now is to aggressively begin confronting Russia. They are weak, the invasion was a very bad idea, and they have zero global support for what they're doing and mediocre support at home for the invasion.
There is only one way to stop Putin and that's military confrontation. NATO is vastly superior to Russia's forces, now is an excellent time to cripple them in the field.
Every time war doesn't go Russia's way they're going to nuke the world? Yeah, sure. Good luck living in that universe. You know, we really can't defend Finland or Sweden or the Baltics (NATO), because hey Russia will nuke everybody, so they just get to keep taking territory at will. Time to go ahead and shut down NATO (you know, the organization that was originated specifically to stand off militarily with Russia, its primary reason for existing). No, time to start standing up to Russia in the field: this is what NATO is for.
Ukraine is doing the job that NATO ought to be doing. At the very least we should be helping them dramatically more than what we are now. Don't like the idea of direct confrontation (no-fly zone) - fine, then flood Ukraine with weapons at a much faster pace and put Russia in a position of having to declare war on NATO to stop it.