Putin's ego might prevent him for sitting together with someone like Zelensky in a table. But if its required to bring peace, he should live with that humiliation as it might be the right thing to do at current time to stop the bloodshed.

Ukraine is a buffer zone created as a result of Soviet Union losing the cold war. With changing politco-economic status, the line could be redrawn soon. But it won't prevent any side involved to redrawing it with changing circumstances in the future.