ISTANBUL, TURKEY - (ARCHIVE) : A file photo dated October 10, 2016 shows Russian President Vladimir Putin (R) is being accompanied by Russian Ambassador to Turkey, Andrei Karlov (L) as Vladimir Putin arrives in Istanbul, Turkey to attend the 23rd World Energy Congress. Russian Ambassador to Turkey Andrei Karlov has been shot multiple times at an exhibition in Ankara and died on December 19, 2016. Karlov was delivering a speech at the opening ceremony of a photo exhibit when an armed assailant opened fire on him. (Photo by Islam Yakut/Anadolu Agency/Getty Images)
