Option "C". It's violent and it's also "doing right."
Putin wants to bring Ukraine into his proposed Eurasian Union. He essentially bribed Ukraine's leader, Yanukovych, not to join the European Union, which he had said he was going to do.
People in the eastern part of Ukraine identify as ethnic Russians, speak Russian and generally agree with Ukraine and Russia becoming cozier. They're in the minority.
People in the west of Ukraine speak Ukrainian and identify as ethnic Ukrainians. They're in the majority. They wanted the deal with the European Union and are pissed that Putin and Yanukovych torpedoed it. Yanukovych, by the way, threw out the old Ukrainian constitution after he came to power and crafted a new constitution that basically legitimizes what in essence is a near-dictatorship.
So I can understand the actions of the protestors who feel they have no other recourse to save their vision of what Ukraine is and should be -- and what it should not be.
Don't forget, the USA was born out of violent protest, so from our point of view it's kind of hypocritical to denounce violent protest as being something wrong.
Hey, maybe if Ukraine turns into another Syria, it'll reignite the Cold War and we'll see Reagan-era defense spending again. More money! More manning! Bigger, better, faster, more lethal, and more expensive weapons!!!!! Won't that be great?!