United Kingdom's U.N. Ambassador Mark Lyall Grant, left, arrives for a news conference after a private U.N. Security Council meeting on the Ukraine, Friday, Feb. 28, 2014, at United Nation headquarters. (AP Photo/Bebeto Matthews)
President Barack Obama speaks about the ongoing situation in Ukraine in the Brady Press Briefing Room of the White House in Washington, Friday, Feb. 28, 2014. Obama warned Russia "there will be costs" for any military intervention in Ukraine. (AP Photo/Pablo Martinez Monsivais)
Samantha Power, U.S. Ambassador to the U.N., speaks during a news conference after a private U.N. Security Council meeting on the Ukraine, Friday, Feb. 28, 2014, at United Nation headquarters. (AP Photo/Bebeto Matthews)
Russia's U.N. Ambassador Vitaly Churkin, center, listens during a news conference after a private U.N. Security Council meeting on the Ukraine, Friday, Feb. 28, 2014, at United Nation headquarters. (AP Photo/Bebeto Matthews)