As an American, I am indeed wary of endless militarism. I’ve written about this many times. But as I pointed out during my lecture at PFS 2011 – http://www.vimeo.com/user4741660 – there is a libertarian case for war in places where people want your protection. If my neighbor was being raped, I would not maintain a policy of non-intervention.
As a Ukrainian, how the west or Russia rationalizes their actions or inactions is irrelevant (well put, Curt Doolittle). We see a prosperous, law-abiding Poland to the west and an oppressive, corrupt, murderous, impoverished, propaganda-saturated Russia to the east. Our choice is a rational one, even given the debt and incompetence of the EU which many of my close friends so effectively criticize.