BERLIN - NOVEMBER 09:  (L-R) British Prime Minister Gordon Brown, French President Nicolas Sarkozy, German Chancellor Angela Merkel and Russian President Dmitry Medvedev walk through the Brandenburg Gate on November 9, 2009 in Berlin, Germany. The city of Berlin is celebrating the 20th anniversary of the fall of the Berlin Wall, which led to the end of communist rule in East Germany and later on the reunification of East and West Germany, with a spectacular event at the Brandenburg Gate and the participation of international leaders. Getty Images logo Getty Images 27 months ago

BERLIN - NOVEMBER 09: (L-R) British Prime Minister Gordon Brown, French President Nicolas Sarkozy, German Chancellor Angela Merkel and Russian President Dmitry Medvedev walk through the Brandenburg Gate on November 9, 2009 in Berlin, Germany. The city of Berlin is celebrating the 20th anniversary of the fall of the Berlin Wall, which led to the end of communist rule in East Germany and later on the reunification of East and West Germany, with a spectacular event at the Brandenburg Gate and the participation of international leaders.