To the feckless West this Ukrainian crisis is sudden. Putin on the other hand has been planning for it for years and has necessary contingency plans at the ready. With an impotent US president and toothless EU as his only opposition, this is a lock for a Russian invasion. It appears from the propaganda being put out (i.e. "liberation", protecting the East from murderous right wing fascists) there will be some level of a straight-up invasion by Russia.
I hate being right about tragedy, but with Obama as CinC and his numerous geopolitical blunders in Libya, Syria, Egypt, Iran, Iraq, etc. already on the books it's easy guessing correctly. Who on earth could possibly believe anything the man says? "Don't cross red lines?" "Respect territorial integrity?" Obama has proven to be a liar and opportunist at every turn and utterly ineffective abroad. I cannot think of anything selfless or noble that this President has done. Moreover, he lacks any kind of personal moral courage. He wouldn't risk a toenail to save one of his daughters, much less help a nation of millions of evil, colonialist, Europeans. The man is a narcissistic coward as are a great many Americans these days. He could care less how many people die wherever, as long as his family and entourage are hooked in the US Treasury IV to keep the Obama/Democrat entitlement stash going.
The only thing that saves the Ukraine is the Ukrainian people going to the mat, IED's, suicide vests, and every man, woman, and child with a rifle, and taking the fight to Russia. Not that it is our direct fight. Our major military goal should be getting our troops out of Afghanistan alive with as much equipment as possible. Our forces are functionally surrounded, and a major part of the surrounding force is Russian. The only remaining course of action for the former Warsaw Pact countries and former Soviet republics who wish to remain independent is to arm up big time. And that includes such WMD's as they can acquire from any source.
2014 is the Year of Consequences, when the vultures come home to roost.