President Barack Obama arrives to speak about Ukraine in the James Brady Press Briefing Room at the White House in Washington, Friday, Feb. 28, 2014. Obama&#39;s statement comes as his administration is expressing growing concern over Russian intentions in Ukraine. Secretary of State John Kerry delivered a blunt warning Friday to Moscow against military moves in the country&#39;s southern Crimea region that could further inflame tensions. (AP Photo/Charles Dharapak)