German Chancellor Angela Merkel shakes hands with U.S. President Barack Obama after their speeches next to Berlin Mayor Klaus Wowereit (R) at the Brandenburg Gate in Berlin, June 19, 2013. U.S. President Barack Obama will unveil plans for a sharp reduction in nuclear warheads in a landmark speech at the Brandenburg Gate on Wednesday that comes 50 years after John F. Kennedy declared "Ich bin ein Berliner" in a defiant Cold War address. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS)