Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-7pm ET on CNN.
CNN's Wolf Blitzer speaks with the U.S. Ambassador to the United Nations Samantha Power about the crisis in Ukraine. She says the U.S. is laying the groundwork for sanctions against Russia and refuses to accept the referendum in Crimea to join the Russian Federation.