An agreement between the main players to de-escalate the situation is only a first step toward ending the crisis.
Apr 17, 2014 | 17:05 GMT
Talk of NATO membership could die down quickly if tensions in Ukraine de-escalate.
Apr 17, 2014 | 04:35 GMT
This map shows the approximate locations of U.S. Carrier Strike Groups and Amphibious Ready Groups.
Apr 17, 2014 | 03:47 GMT