U.S. President Barack Obama joins in a meeting on the situation in Ukraine at the NATO Summit at the Celtic Manor Resort in Newport, Wales September 4, 2014. The leaders (From L-R) are: French President Francois Hollande, Ukraine President Porpshenko, Obama, British Prime Minister David Cameron, German Chancellor Angela Merkel and Italian Prime Minister Matteo Renzi. REUTERS/Larry Downing (UNITED KINGDOM - Tags: POLITICS MILITARY)