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ANKARA, TURKEY - JUNE 05: German Foreign Minister and Vice Chancellor Sigmar Gabriel speaks to the media after his meeting with Turkish Foreign Minister Mevlut Cavusoglu (not pictured) on June 05, 2017 in Ankara, Turkey. Gabriel is on a one-day trip to conduct political talks with members of the government and opposition. (Photo by Thomas Trutschel/Photothek via Getty Images)

ANKARA, TURKEY - JUNE 05: German Foreign Minister and Vice Chancellor Sigmar Gabriel speaks to the media after his meeting with Turkish Foreign Minister Mevlut Cavusoglu (not pictured) on June 05, 2017 in Ankara, Turkey. Gabriel is on a one-day trip to conduct political talks with members of the government and opposition. (Photo by Thomas Trutschel/Photothek via Getty Images)