1) you guys do know crimea was russia for a long time?
To be exact since 1783 "from now and for all times", accepted by the former rulers (osman empire) officially in 1792.
The movement to the ukraine was just a administrative manouver, since nobody believed there would ever be a real border between russia and ukraine (because both were UdSSR)
1991 more then 90% of the people of crimea voted for a crimea in the UdSSR treaty, accepted by the ukraine government. At the same time the ukraine said crimea is part of ukraine, but that edict itself is legally faulty and as such not valid.
Only by granting the crimea outonomous rights the ukraine could prevent them from a referendum for independence.
You would send troops (illegally btw) to go against the will of the crimean people just to anger Putin? Thats the reason why we are so close to a new Cold War and hot conflicts!
2) You know that the referedum said "yes" to russia and was way more legal then others The West accepted as true? Just look at the Balkan.