Ukraine 2014

Been following the events in Ukraine for some time now.  This week, late February 2014, things seem to have come to a head.  Reminds me eerily of Hungary 1956.  If the Russians move in from the east will the U.S. or N.A.T.O. move in from the west?  If not will this re-create the "spheres of influence" which the putative end of the Cold War terminated?  If not will Western governments be reviled for decades for in effect giving Russia a free hand in the nations which border it?  If not what will be the chilling effect in those nations?  However if yes, the West does intervene militarily does this mean a shooting war to contest a corrupt bankrupt and perhaps hopelessly divided Ukraine?  Interesting times.