Call me old-fashioned, but my only real concern about this is if the conflict is going to spill over into the neighbouring states or the rest of the world. I heard from folks I know in the military that the U.S. and Canada both sent a squadron each of F-18s to fly CAPs over Ukrainian airspace, and that Canada is sending a destroyer (I heard a name - possibly the Iroquois) as part of a NATO group into the Baltic Sea (or perhaps it was the Black Sea). Also heard that Russia is preparing to send in regular army troops, though that is probably just an anecdote unless I missed some news during my skim of this thread.
If I am worried it's because I'm going to be in Budapest on vacation later this month - I probably don't have reason to worry, but just a little bit extra reason to memorize where the Canadian and American embassies are, in case Murphy's law decides to **** me.
Honestly I'm not surprised on Putin's move here. His particular motives don't interest me (choose anything from a growing list of nationalistic or expansionistic ideas), I figured after Georgia, it was only a matter of time before it happened somewhere else in the post-soviet nations.