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VORONEZH REGION, RUSSIA. MARCH 15, 2016. Russian military officers lift up a pilot of a Russian Air Force Sukhoi Su-34 fighter bomber, one of the first group of Russian military aircraft to return from Syria following an operation against the ISIL and other terrorist groups, during the arrival ceremony at a military installation in Voronezh Region. The Russian president has announced the withdrawal of the main part of Russia's military contingent from Syria, starting on March 15, 2016. Irina Sokolova/TASS (Photo by Irina Sokolova\TASS via Getty Images)

VORONEZH REGION, RUSSIA. MARCH 15, 2016. Russian military officers lift up a pilot of a Russian Air Force Sukhoi Su-34 fighter bomber, one of the first group of Russian military aircraft to return from Syria following an operation against the ISIL and other terrorist groups, during the arrival ceremony at a military installation in Voronezh Region. The Russian president has announced the withdrawal of the main part of Russia's military contingent from Syria, starting on March 15, 2016. Irina Sokolova/TASS (Photo by Irina Sokolova\TASS via Getty Images)