The Ukrainian president was ousted after rejecting a Pro-European deal. There were revolts and he loses his job. That tells me that most Ukrainians were for the deal. But, if Crimea is mostly pro-russia, would they not want to reject the deal and go with the stronger russian economic ties? Makes sense to me. But when the President was ousted and a Pro-european interim president is in, it makes sense to me that Crimea would want to break from Ukraine and join Russia. Whether or not Crimea's vote to become independent from Ukraine is legal or not has nothing to do with us. Crimea and Russia both wish for it to join (seems they already have) and Ukraine does not.
I still don't see what this has to do with us. Why should we throw our support (meaning money) to Ukraine? And to sanction Russia for allowing Crimea to join them? Doesn't seem like we should.
If there was some proof somewhere that Russia forced Crimea to leave Ukraine and join them, then I get it. Until then, it doesn't seem any of our business.