I love how Russians treat Crimea as Russian territory with almost no countries recognizing it. Who cares about that international laws?
There's the de jure, and then there's the
de facto. Crimea is now
de facto part of Russia, and taking it away via any sort of legislative means is not going to happen. Easily, at the very least. For one, in order to legally return it to the Ukraine, you have to first legally admit it has changed ownership, which Ukrainian government isn't too keen on doing. As long as its legal status in Ukraine remains as "a part of Ukraine", it can't be given back to Ukraine. By legally - by its own constitution - admitting newly self-declared independent Crimea into itself, Russia has turned a legally sketchy situation with the unrest, referendum and independence, that seems to have been the playground for every major power around, into a
legal quagmire that isn't likely to be resolved.
When countries wage legal war, it's not likely to end quickly. Sometimes not at all. Just as with big companies doing the same. The most likely outcome is, like with companies, a settlement - which between countries is called
diplomacy, which is what they're now doing. Exactly what the costs will be, and what will happen, I've no idea - only time will tell.