I could see maybe Ukraine letting Russia have the areas it has stolen, for now, if it means a pause in the war. Remembering that the long run could be a different story.
In the long run, there is also the competition in fields like economics, quality of life, public opinion and where people most wish to live. More freedom can win in the long run.
People might not wish to live, or be able to flourish, in the areas occupied by Russia, compared to the rest of Ukraine and Europe.
About cities that Russia has bombed, there is the pottery barn rule. You break it, you own it. Hopefully the people who want something better can escape to a new life elsewhere.