Here are the latest additions to The Best Resources On The Protests (& Crisis) In Ukraine:
Crisis in the Crimea: The Showdown Between Ukraine and Russia is a GREAT interactive from Smithsonian Magazine.
The U.S. has treated Russia like a loser since the end of the Cold War is a very interesting piece from the former ambassador to the USSR.
Former U.S. Ambassador to USSR: Let Russia Take Crimea is a shorter piece from the same diplomat, and appeared in TIME.