Perhaps the people of Crimea have a right to determine their own fate, and the majority may indeed wish to rejoin Russia. However that decision should not be made looking down the wrong end of Putin's guns!
If Russia withdrew with a UN promise to hold a democratic and free vote on that question, and Russia was to agree that the rest of Ukraine would have soverign self determination including tne right to join NATO a fair outcome could result.
The problem is that arseholes like Putin here, and Bush in Iraq have no concept of diplomacy! If you have big guns better to follow the lead of Hitler and Stalin!