The legality of what Putin's doing seems kinda funny to me. We can only really bitch about legality if we're actually going to go ahead with sanctions, and it seems like Germany and most of Europe are pussing out on that, with the U.S. response still being up in the air. Putin's in the wrong, sure, but so what? He and his generals have wargamed the whole scenario and concluded they can get away with taking Crimea, and he's probably right.
"The sanity of the plan is of no consequence!" - "And why is that?" - "Because he can DO it!" and all that jazz.