But for the fact tha 5,000 people a week are dying in Ukraine on both sides, I'd say wait it out and let Russia suffer total defeat in Ukraine. That would guarantee Putin's government falls and ceases to ever be a threat to Ukraine, the EU or anyone else.
The well-known sources in this video present solid demographics for why Russia can't win in the long run. They can get tens of thousands more killed on both sides, but they can't win.