You don't change any of the context that led Russia to invade in the first place. You leave intact an aggressor who has repeatedly and consistently expanded. You gave them Crimea and hoped that would appease them. You tolerated their aggressions in eastern Ukraine. Now you will just give them Donbas and Luhansk and hope once again to appease them?
That strategy might be better accepted if the world hadn't seen 1938-1939.