Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim attend festivities to mark the 30th anniversary of the German reunification, in Potsdam, Germany, October 3, 2020. Soeren Stache/Pool via REUTERS

Former German Chancellor Gerhard Schroeder talks to Manuela Schwesig, Mecklenburg-Western Pomerania's State Premier before the memorial service for late Brandenburg state prime Minister Manfred Stolpe at the Nikolai church (Nikolaikirche) in Potsdam, Germany, January 21, 2020. Soeren Stache/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim attend the memorial service for late Brandenburg state prime Minister Manfred Stolpe at the Nikolai church (Nikolaikirche) in Potsdam, Germany, January 21, 2020. Soeren Stache/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim attend the memorial service for late Brandenburg state prime Minister Manfred Stolpe at the Nikolai church (Nikolaikirche) in Potsdam, Germany, January 21, 2020. Soeren Stache/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim pose as they arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim pose as they arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive for the opening of the Bayreuth Wagner Festival at the Richard Wagner Festival Hall in Bayreuth, Germany July 25, 2019. REUTERS/Andreas Gebert

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive before the traditional St.Matthew's Day banquet (Matthiae-Mahlzeit) in the City Hall in Hamburg, Germany February 22, 2019. REUTERS/Fabian Bimmer

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive before the traditional St.Matthew's Day banquet (Matthiae-Mahlzeit) in the City Hall in Hamburg, Germany February 22, 2019. REUTERS/Fabian Bimmer

Former German Chancellor Gerhard Schroeder and his wife Soyeon Kim arrive before the traditional St.Matthew's Day banquet (Matthiae-Mahlzeit) in the City Hall in Hamburg, Germany February 22, 2019. REUTERS/Fabian Bimmer

IHF Handball World Championship - Germany & Denmark 2019 - Group A - Korea v Germany - Mercedes-Benz Arena, Berlin, Germany - January 10, 2019 Former Chancellor of Germany Gerhard Schroeder (R) and his wife Kim So-yeon in the stands REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

The name plaque of former German Chancellor Gerhard Schroeder is pictured outside his office during an interview with Reuters in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is seen reflected on the surface of his desk during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder is pictured during an interview with Reuters in his office in Berlin, Germany, November 15, 2018. Picture taken November 15, 2018. REUTERS/Fabrizio Bensch

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Wärner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Waerner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Wärner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Waerner/Pool via Reuters

Former German Chancellor Gerhard Schroeder, his wife Kim So-yeon and her mother pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Waerner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Waerner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon welcome Scorpions lead singer Klaus Meine and his wife Gabi during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Waerner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose with Sigmar Gabriel and his wife Anke during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Wärner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Wärner/Pool via Reuters

Former German Chancellor Gerhard Schroeder and his wife Kim So-yeon pose during a reception before their wedding party in Berlin, Germany, October 5, 2018. Kai-Uwe Wärner/Pool via Reuters

Vladimir Chizhov, Russian envoy to the European Union, Gerhard Schroeder, former German Chancellor and chairman of the shareholders’ committee at Nord Stream AG, and Gazprom deputy chief executive Alexander Medvedev attend a working breakfast as part of the St. Petersburg International Economic Forum (SPIEF), Russia May 25, 2018. REUTERS/Sergei Karpukhin

Former German Chancellor Gerhard Schroeder, chairman of the shareholders’ committee at Nord Stream AG, attends a working breakfast as part of the St. Petersburg International Economic Forum (SPIEF), Russia May 25, 2018. REUTERS/Sergei Karpukhin

IOC President Thomas Bach, his wife Claudia, Former German Chancellor Gerhard Schroeder and his partner Kim So-yeon pose at the President's Dinner on the eve of the Opening Ceremony for the Pyeongchang 2018 Winter Olympics in Pyeongchang, South Korea, February 8, 2018. REUTERS/Eric Gaillard

Former German Chancellor Gerhard Schroeder and his partner Kim So-yeon attend the President's Dinner hosted by IOC President Thomas Bach on the eve of the Opening Ceremony for the Pyeongchang 2018 Winter Olympics in Pyeongchang, South Korea, February 8, 2018. REUTERS/Eric Gaillard

IOC President Thomas Bach greets former German Chancellor Gerhard Schroeder as Bach's wife Claudia looks on at the President's Dinner on the eve of the Opening Ceremony for the Pyeongchang 2018 Winter Olympics in Pyeongchang, South Korea February 8, 2018. REUTERS/Eric Gaillard

Doris Schroeder-Koepf (C), ex-wife of former German chancellor Gerhard Schroeder reacts following first exit polls for the Lower Saxony state elections at the Social Democratic Party (SPD) headquarters in Hanover, Germany October 15, 2017. REUTERS/Wolfgang Rattay

Doris Schroeder-Koepf (2nd L), ex-wife of former German chancellor Gerhard Schroeder following first exit polls for the Lower Saxony state elections at the Social Democratic Party (SPD) headquarters in Hanover, Germany October 15, 2017. REUTERS/Wolfgang Rattay

Doris Schroeder-Koepf (C), ex-wife of former German chancellor Gerhard Schroeder reacts as she awaits first exit polls for the Lower Saxony state elections at the Social Democratic Party (SPD) headquarters in Hanover, Germany October 15, 2017. REUTERS/Wolfgang Rattay

Gerhard Schroeder (R), newly elected Chairman of Russia's biggest oil producer Rosneft, attends a news briefing in St. Petersburg, Russia September 29, 2017. REUTERS/Olesya Astakhova

Gerhard Schroeder, newly elected Chairman of Russia's biggest oil producer Rosneft, attends a news briefing in St. Petersburg, Russia September 29, 2017. REUTERS/Olesya Astakhova

A combination of file photos shows German Chancellor Angela Merkel in Berlin, Germany, September 19, 2016 (C, top) and September 24, 2017 (C, bottom) and her challengers for chancellor Martin Schulz, Peer Steinbrueck, Frank-Walter Steinmeier and former German chancellor Gerhard Schroeder. REUTERS/Staff

A combination of file photos shows German Chancellor Angela Merkel in Berlin, Germany, September 19, 2016 (C, top) and September 24, 2017 (C, bottom) and her challengers for chancellor Martin Schulz, Peer Steinbrueck, Frank-Walter Steinmeier and former German chancellor Gerhard Schroeder. REUTERS/Staff

A combination of file photos shows German Chancellor Angela Merkel in Berlin, Germany, September 19, 2016 (C, top) and September 24, 2017 (C, bottom) and her challengers for chancellor Martin Schulz, Peer Steinbrueck, Frank-Walter Steinmeier and former German chancellor Gerhard Schroeder. REUTERS/Staff

A combination of file photos shows German Chancellor Angela Merkel in Berlin, Germany, September 19, 2016 (C, top) and September 24, 2017 (C, bottom) and her challengers for chancellor Martin Schulz, Peer Steinbrueck, Frank-Walter Steinmeier and former German chancellor Gerhard Schroeder. REUTERS/Staff

FILE PHOTO: A combination of file photos shows German Chancellor Angela Merkel in Essen, Germany, December 6, 2016, and her challengers for chancellor Martin Schulz, Frank-Walter Steinmeier, Peer Steinbrueck and former German chancellor Gerhard Schroeder. REUTERS/Staff/File Photo

Journalists take photos of a picture from a TV debate of former German Chancellor Gerhard Schroeder and his former conservative challenger Edmund Stoiber from 2002 at the Adlershof TV studio, in Berlin, Germany, September 1, 2017. REUTERS/Hannibal Hanschke

Former German Chancellor and SPD member Gerhard Schroeder smiles after a debate as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder is seen during a debate as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder gestures during a debate as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder is seen during a debate as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder gestures during a debate as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder speaks with Lars Klingbeil of the SPD as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder reacts as he joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen

Former German Chancellor and SPD member Gerhard Schroeder joins the campaign trail in Rotenburg, Germany, August 30, 2017. REUTERS/Morris Mac Matzen