What about incorporating Ukraine, Belarus, Georgia, and Russia into NATO?
Ukraine gets the Donbas back in return for international recognition of Crimea as Russian territory.
Fanciful, I know. And questionable whether Article 8 would hold up. But advantages:
1. End to the conflict 2. Security guarantees for all of Europe 3. Repurposing of NATO from anti Russia alliance to anti China alliance, ie pivot to Asia