German Chancellor Angela Merkel, German Social Democratic Party (SPD) leader Sigmar Gabriel and French President Francois Hollande are pictured at the Gewandhaus concert hall in Leipzig, eastern Germany as they attend festivities to mark the SPD's 150th anniversary on May 23, 2013. The SPD, Europe's oldest political party, has invited nearly 50 current and former heads of state and government as it celebrates 150th birthday and its turbulent history, which saw it advance workers rights and suffer persecution by the Nazis. The SPD was founded on May 23, 1863 in Leipzig as the 'Allgemeiner Deutscher Arbeiterverein' (common German worker's club). AFP PHOTO / POOL / ODD ANDERSEN
Credit: ODD ANDERSEN
In this handout photo provided by the German Government Press Office (BPA), German Chancellor Angela Merkel visits the German National team in their dressing room after the 2014 FIFA World Cup Brazil Group G match between Germany and Portugal at Arena Fonte Nova on June 16, 2014 in Salvador, Brazil.
German Chancellor Angela Merkel speaks to the media at the conclusion of the 2012 Council of Baltic Sea States Summit at the Ozeaneum maritime museum on May 30, 2012 in Stralsund, Germany. Leaders of the eleven member states as well as representatives of the European Union are meeting to discuss matters related to energy, the environment and economic development during the two-day summit.
Credit: Sean Gallup
In this handout photo provided by the German Government Press Office (BPA), German Chancellor Angela Merkel and German President Joachim Gauck celebrate with the German national team after it's 1-0 victory in the 2014 FIFA World Cup Brazil Final match against Argentina at Maracana on July 13, 2014 in Rio de Janeiro, Brazil.
German Chancellor Angela Merkel poses moments after giving her New Year's television address to the nation at the federal chancellery (Bundeskanzleramt) on December 30, 2013 in Berlin, Germany. Merkel spoke of the challenges and priorities set for the German government for 2014.
Credit: Adam Berry
German Chancellor Angela Merkel prepares to welcome French Prime Minister Manuel Valls at the Chancellery on September 22, 2014 in Berlin, Germany. Valls is on a two-day visit to Germany at a time when Merkel has been critical of the slow pace of French economic reforms.
Credit: Sean Gallup
In this file photo German Chancellor Angela Merkel and Russian President Vladimir Putin attend commeoration ceremonies marking the 70th anniversary of the D-day invasion of Nazi-occupied Normandy on June 6, 2014 in Ouistreham, France. Merkel and other leaders of NATO-member states are attending a NATO summit in Newport, Wales, from September 4-5, 2014, and Russia's active involvement in the war in eastern Ukraine is high on the summit agenda.