DarzaR: Tatars arent natives in Crimea too. You could easily give it back to Greece if youll dig it far enough. Or Turkey. It simply doesnt work this way.
Oh this wasn't about realism and power politics. It was a simple: If you could decide, what would you do?
In principle nobody is really native somewhere. Still history counts and plays a role. For germany for example history of the last 100 years is quite some burden and rightly so. And for Russia this will be a burden too. People will remember it.
Sure the further you go away the less important it should become. But a big deportation around 70 years ago should still matter today, at least in my books. An offer of compensation might be in order. if this hadn't happened, there would be much more Tartars living. And I wonder specifically what they would want? Would they want to be part of Russia, of Ukraine or being independent? We have a duty of making right, what others did wrong in history, at least nearer history. Anyway you can never do it completely right, but you can try for some kind of rightness.
The gifting of Crimea to Ukraine I see not as that decisive. It was at a time where anyway everything belonged together. But in 1990 Russia basically forfeit Crimea and acknowledged it during several treaties. Basically this meant that at that time Russia didn't want to have Crimea. Now taking it... sorry not the right way. Still I see a strong claim except for the last 20+ years.
And there comes the Ukrainian claim. For the last 20+ years they took care of Crimea and not that badly. Did they really give any reason to the Crimeans to believe they are second class or something else this way? I guess mostly not. That and one quarter of the people constitutes also a claim.
So I don't know really. I would say that the Russian claim indeed is a tiny bit bigger than the Ukrainian or Tartarian but these exist too. One would have to think about it for quite some time and make some kind of compromise to make all involved parties kind of happy, not only one.
But of course that is not the way it works. The way it works is that the most bold party just takes what it wants and that's it. But maybe they didn't really think it through. All the other neighbors will probably not just tolerate this but will seek sanctions and that's what's happening. Russia has resources but otherwise the economy is very weak. I would say they need partners in the world. They don't have many currently. Maybe because they act so blunt. You cannot just send your troops somewhere and say everything is fine. "Self defense" forces is even more hilarious than "Good news" for the introduction of regional prices.