Former German Foreign Minister Sigmar Gabriel speaks at a joint meeting of the Marshall Fund, the American Council on Germany, the Atlantic Bridge and the Aspen Institute U.S. during the visit of U.S. Secretary of State Antony Blinken following talks on the Ukraine crisis in Berlin, Germany, January 20, 2022. Bernd Von Jutrczenka/Pool via REUTERS 

Tennis - bett1ACES exhibition tournament - Steffi Graf Stadium, Berlin, Germany - July 15, 2020 Former German Minister for Foreign Affairs, Sigmar Gabriel watches the final match between Austria's Dominic Thiem and Italy's Matteo Berrettini REUTERS/Hannibal Hanschke 

Former German Foreign Minister Sigmar Gabriel arrives for a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

Former German Foreign Minister Sigmar Gabriel arrives for a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

German journalist Guenter Wallraff, former German Interior Minister Gerhart Baum and former German Foreign Minister Sigmar Gabriel show a paper clipping before a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

German journalist Guenter Wallraff, former German Interior Minister Gerhart Baum and former German Foreign Minister Sigmar Gabriel show a paper clipping before a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

German journalist Guenter Wallraff and former German Foreign Minister Sigmar Gabriel show a paper clipping before a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

German journalist Guenter Wallraff and former German Foreign Minister Sigmar Gabriel show a paper clipping before a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

German journalist Guenter Wallraff and former German Foreign Minister Sigmar Gabriel show a paper clipping before a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

German journalist Guenter Wallraff, former German Interior Minister Gerhart Baum and former German Foreign Minister Sigmar Gabriel show a paper clipping before a news conference calling for the release of activist Julian Assange, in Berlin, Germany, February 6, 2020. REUTERS/Hannibal Hanschke 

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 SPD party leaders Franz Muentefering and Sigmar Gabriel attend a one-day party congress of the Social Democratic Party (SPD) in Wiesbaden, Germany, April 22, 2018. REUTERS/Ralph Orlowski 

Former German Foreign Minister Sigmar Gabriel speaks to the new Foreign Minister Heiko Maas during a handover ceremony in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

Former German Foreign Minister Sigmar Gabriel speaks next to the new Foreign Minister Heiko Maas during a handover ceremony in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

Former German Foreign Minister Sigmar Gabriel shakes hands with new Foreign Minister Heiko Maas during a handover ceremony in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

Former German Foreign Minister Sigmar Gabriel waves during a handover ceremony for the new Foreign Minister Heiko Maas in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

Former German Foreign Minister Sigmar Gabriel speaks during a handover ceremony for the new Foreign Minister Heiko Maas in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

German Chancellor Angela Merkel (C) talks to outgoing German Foreign Minister Sigmar Gabriel (R) and Volker Kauder, parliamentary group leader of the ruling CDU/CSU faction in the German Bundestag during a session of the German lower house to elect a new chancellor, in Berlin, Germany, March 14, 2018. REUTERS/Kai Pfaffenbach 

German Chancellor Angela Merkel (C) talks to outgoing German Foreign Minister Sigmar Gabriel (R) and Volker Kauder, parliamentary group leader of the ruling CDU/CSU faction in the German Bundestag during a session of the German lower house to elect a new chancellor, in Berlin, Germany, March 14, 2018. REUTERS/Kai Pfaffenbach 

German Chancellor Angela Merkel talks to outgoing German Foreign Minister Sigmar Gabriel during a session of the German lower house of parliament Bundestag to elect a new chancellor, in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel casts his vote to elect German chancellor during a session of the German lower house of parliament Bundestag in Berlin, Germany, March 14, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel leaves a news conference after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel leaves a news conference after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel speaks during a news conference after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel and his counterpart from Bosnia and Herzegovina, Igor Crnadak, shake hands after a news conference in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel speaks during a news conference after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel and his counterpart from Bosnia and Herzegovina, Igor Crnadak, attend a news conference in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel speaks during a news conference after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Foreign Minister of Bosnia and Herzegovina, Igor Crnadak, attends a news conference after a meeting with the outgoing German Foreign Minister Sigmar Gabriel in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel and his counterpart from Bosnia and Herzegovina, Igor Crnadak, attend a news conference in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel gestures after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

Outgoing German Foreign Minister Sigmar Gabriel speaks after a meeting with his counterpart from Bosnia and Herzegovina, Igor Crnadak, in Berlin, Germany, March 8, 2018. REUTERS/Hannibal Hanschke 

German Foreign Minister Sigmar Gabriel and Chancellor Angela Merkel attend the weekly cabinet meeting at the Chancellery in Berlin, Germany, March 7, 2018. REUTERS/Fabrizio Bensch 

German Foreign Minister Sigmar Gabriel, Chancellor Angela Merkel and Chancellery minister Peter Altmaier attend the weekly cabinet meeting at the Chancellery in Berlin, Germany, March 7, 2018. REUTERS/Fabrizio Bensch 

German Foreign Minister Sigmar Gabriel, Chancellor Angela Merkel and Chancellery minister Peter Altmaier attend the weekly cabinet meeting at the Chancellery in Berlin, Germany, March 7, 2018. REUTERS/Fabrizio Bensch 

German Foreign Minister Sigmar Gabriel, Chancellor Angela Merkel and Chancellery minister Peter Altmaier attend the weekly cabinet meeting at the Chancellery in Berlin, Germany, March 7, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel walk outside the Villa Borsig government guest house after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel walk outside the Villa Borsig government guest house after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel walk in the park of the Villa Borsig government guest house after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel help a photojournalist who fell outside the Villa Borsig government guest house in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel help a photojournalist who fell outside the Villa Borsig government guest house in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel walk in the park of the Villa Borsig government guest house after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel walk in the park of the Villa Borsig government guest house after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel after a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu during a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu gives a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel give a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Turkish Foreign Minister Mevlut Cavusoglu and his German counterpart Sigmar Gabriel give a statement in Berlin, Germany, March 6, 2018. REUTERS/Fabrizio Bensch 

Siemens CEO Joe Kaeser (L) and German Foreign Minister Sigmar Gabriel meet Russian Foreign Minister Sergei Lavrov at the Munich Security Conference in Munich, Germany, February 17, 2018. REUTERS/Ralph Orlowski 

Russian Foreign Minister Sergei Lavrov (L) attends a meeting with German Foreign Minister Sigmar Gabriel (not pictured) at the Munich Security Conference in Munich, Germany, February 17, 2018. REUTERS/Ralph Orlowski 

German Foreign Minister Sigmar Gabriel talks during a meeting with Russian Foreign Minister Sergei Lavrov (not pictured) at the Munich Security Conference in Munich, Germany, February 17, 2018. REUTERS/Ralph Orlowski 

General view of a meeting with Russian Foreign Minister Sergei Lavrov and German Foreign Minister Sigmar Gabriel at the Munich Security Conference in Munich, Germany, February 17, 2018. REUTERS/Ralph Orlowski 

German Foreign Minister Sigmar Gabriel talks at the Munich Security Conference in Munich, Germany, February 17, 2018. REUTERS/Ralph Orlowski 

German Foreign Minister Sigmar Gabriel arrives to meet his Turkish counterpart Mevlut Cavusoglu (not pictured) at the Munich Security Conference in Munich, Germany, February 16, 2018. REUTERS/Michaela Rehle 

German Foreign Minister Sigmar Gabriel meets Turkish Foreign Minister Mevlut Cavusoglu at the Munich Security Conference in Munich, Germany, February 16, 2018. REUTERS/Michaela Rehle 

German Foreign Minister Sigmar Gabriel meets Turkish Foreign Minister Mevlut Cavusoglu at the Munich Security Conference in Munich, Germany, February 16, 2018. REUTERS/Michaela Rehle 

German Foreign Minister Sigmar Gabriel meets Turkish Foreign Minister Mevlut Cavusoglu at the Munich Security Conference in Munich, Germany, February 16, 2018. REUTERS/Michaela Rehle 

German Foreign Minister Sigmar Gabriel meets Turkish Foreign Minister Mevlut Cavusoglu at the Munich Security Conference in Munich, Germany, February 16, 2018. REUTERS/Michaela Rehle 

German Foreign Minister Sigmar Gabriel gives a statement in the newsroom of Die Welt in Berlin, Germany, February 16, 2018. REUTERS/Axel Schmidt