US President Barack Obama (C) sits next to his Polish counterpart Bronislaw Komorowski (R) as they host a dinner for Central and European Union leaders at the presidential palace in Warsaw on May 27, 2011. The US president landed in Poland today on the final leg of his European tour, to meet leaders from ex-communist states whose own reforms could hold lessons for the Arab Spring. AFP Photo/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)