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MOSCOW, RUSSIA - DECEMBER 20, 2016: The body of Russia's Ambassador to Turkey Andrei Karlov has been delivered to Vnukovo International Airport by a charter flight. Karlov was shot dead on December 19, 2016 in Ankara's Contemporary Art Centre. Valery Sharifulin/TASS (Photo by Valery Sharifulin\TASS via Getty Images)

MOSCOW, RUSSIA - DECEMBER 20, 2016: The body of Russia's Ambassador to Turkey Andrei Karlov has been delivered to Vnukovo International Airport by a charter flight. Karlov was shot dead on December 19, 2016 in Ankara's Contemporary Art Centre. Valery Sharifulin/TASS (Photo by Valery Sharifulin\TASS via Getty Images)