THE HAGUE, NETHERLANDS - MARCH 24:  (L-R) British Prime Minster David Cameron and U.S. President Barack Obama attend a meeting of the G7 leaders on March 24, 2014 in The Hague, Netherlands. The G7 countries are meeting to discuss the recent developments in Ukraine, and to consider their response and any sanctions to be imposed upon Russia in answer to its annexing of the Crimea region. (Photo by Jerry Lampen - Pool/Getty Images)