U.S. President Barack Obama and his wife Michelle wave upon their arrival as German Chancellor Angela Merkel and her husband Joachim Sauer look on before bilateral talks on April 3, 2009 in Baden Baden, Germany. The two leaders were meeting shortly before a summit of the 28 NATO member countries, which is taking place April 3-4 in Strasbourg, Kehl and Baden Baden on the 60th anniversary of the transatlantic military and political organization.