Marina Davydova Karlova (C), widow of late Russian Ambassador to Turkey Andrei Karlov, reacts in front of his coffin, during a ceremonial farewell with full state honours on the tarmac of Ankara's Esenboga Airport on Dec. 20, 2016, a day after Russian Ambassador to Turkey Andrey Karlov was shot dead by a gunman. (Xinhua/Mustafa Kaya)