German Foreign Minister Guido Westerwelle (R) and his partner Michael Mronz pose upon arrival for a state dinner for the US president in Berlin, on June 19, 2013. US President Barack Obama walks in John F. Kennedy's footsteps on his first visit to Berlin as US president, but encounters a more powerful and sceptical Germany in talks on trade and secret surveillance practices.  AFP PHOTO / OLIVER LANG        (Photo credit should read OLIVER LANG/AFP/Getty Images)