Unfortunately, the west is calibrating military aid to Ukraine now. That is managing Putin and his incompetent army but not allowing Ukraine enough fire power to throw out the invaders. Putin will be allowed to, as Macron said openly, “save face”, keep the stolen land bridge and no more. The Russian fairy taledreams of Novorossiya and Odesa are gone forever. Let alone Kyiv, of course.
I can see an agreement where Russia keeps Crimea, but nothing else. And it removes ALL troops, advisors, government workers, or whatever from ALL of Ukraine (sans, Crimea).