Earlier quoted context omitted.
All indications suggest that Russia also wants Odessa and the rest of the black sea coastline, which would probably never be acceptable even with NATO membership.
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According to NDI(Movember 2023): 42% say that Ukraine should engage in negotiations, but 84% do not find it acceptable to end the war if it means letting Russia have the territory it controls currently. Even if Russia leaves all territory occupied since the 2022 invasion, 73% won't agree to such peace deal, they want pre-2014 borders. https://www.ndi.org/publications/opportunities-and-challenge...
If there are any newer poll results, please share.