I think the best that can could be done is for NATO to take a calulated risk and declare war on Russia recue Ukraine.
In The news there is brutal leared loal to Putin who has a parmeliray group said to be headed for Ukraine. Essentially the Russian version of the Nazi SS. They will do the killing and terrorizing that the Russian conscripts might find hard to do. Known for torture and butchering.
I wouldn’t go so far as to officially declare war. But I would as I’ve suggested days ago secure western Ukraine to ease the humanitarian burden on neighboring countries. Then, for crimes against humanity, enact a no-fly zone, freeing up Ukrainian forces to press the fight against Russia until they take back all of Ukraine.
If Russia wants to continue to terrorize Ukraine from within Russia, Ukrainian forces can enter Russia as they see fit. Though I suspect by this time Putin will be on the lam and Russian hostilities will cease.
Then proper reparations for the rebuilding of Ukraine can begin.
Putin is a bully. Bullies are usually cowards. Putin does not want to lose his power, his personal comfort, his life. When push comes to shove, those will be his priorities. He does nothing for Russia. He does for Putin.