US President Barack Obama (R) walks with Polish President Bronislaw Komorowski (C) as they review a guard of honour during an official welcome at the presidential palace in Warsaw on May 28, 2011. Obama was to wrap up his European tour by meeting on May 28 with the leaders of staunch ally Poland as Warsaw gets set to take the helm of the European Union. AFP PHOTO / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)