The best chance for Ukraine to keep their country including Odessa, is to sue for peace.
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Russia was never going to allow Ukraine to join NATO. Its just a geopolitical reality. There probably was a path to peace that would have avoided this catastrophe (by agreeing to not pursue NATO membership) but that seems to be a lost opportunity.
This conflict only deepens as the costs rise. The real danger is some type of miscalculation that sparks a direct confrontation between Russia and the West. Who knows what that might lead to?
I don’t believe Zelensky was ever going to join NATO, but he and his predecessor have grossly mismanaged this country and allied themselves with the worst elements of the war mongers who supposedly represent us in the West.