There are (at least) two sides to the Ukraine and Crimea stories, and I’m not sure we have much chance to follow any of them here, just Putin bad other guy good. Many say WE installed the government in Ukraine, against the wishes of the citizenry.
I recognize that. Does that give Russia the right to enter a sovereign nation and do what it wants?
If there was a beef over that, then address that.
You don’t simply march across borders and absorb the territory you want