This is a poor case. It's like Mississipi splitting off from the US and joining France and then the US retaking it. Mississippi has been part of the US for a long long time. Crimea has been part of Russia for as long as we have been an independent nation.
Though I support Ukraine in the current war, I saw the Crimea issue as you do, it was historically Russian, going back three hundred years. I wasn’t surprised when Putin took it back, I was only surprised that Russia ever let it go in the first place.
Now, if Ukraine were to claim it as reparations for the war, it wouldn’t upset me. But I suspect that is a bridge too far. Russia will never give it up.