Participants in the EU-USA Summit pose for a group photo in Prague April 5, 2009. (first row L-R) European Parliament President Hans-Gert Poettering, Finland's President Tarja Halonen, Latvia's President Valdis Zatlers, Cyprus' President Dimitris Christofias, U.S. President Barack Obama, Czech Republic's Prime Minister Mirek Topolanek, Czech Republic's President Vaclav Klaus, Poland's President Lech Kaczynski, Lithuania's President Valdas Adamkus, Romania's President Traian Basescu, France's President Nicolas Sarkozy, European Commission President Jose Manuel Barroso, EU foreign policy chief Javier Solana, (2nd row L-R) Malta's Prime Minister Lawrence GonziItaly, Italy's Prime Minister Silvio Berlusconi, German Chancellor Angela Merkel, Ireland's Prime Minister Brian Cowen, Poland's Prime Minister Donald Tusk, Spanish Prime Minister Jose Luis Rodriguez Zapatero, Sweden's Prime Minister Fredrik Reinfeldt, Slovenia's Prime Minister Borut Pahor, Belgium's Prime Minister Herman Van Rompuy, Greek Prime Minister Costas Karamanlis, Luxembourg's Prime Minister Jean-Claude Juncker, Slovak Prime Minister Robert Fico, British Prime Minister Gordon Brown, (3rd row L-R) Finland's Prime Minister Matti Vanhanen, Bulgaria's Prime Minister Sergei Stanishev, Estonia's Prime Minister Andrus Ansip, Austrian Chancellor Werner Faymann, Portugal's Prime Minister Jose Socrates. REUTERS/Herwig Prammer (CZECH REPUBLIC POLITICS)