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FEODOSIYA, CRIMEA, RUSSIA - JANUARY 14, 2017: S-400 Triumf medium-range and long-range surface-to-air missile systems at the base of the Russian Southern Military District's air defence missile regiment. The regiment's personnel underwent re-training and held missile test launches as part of the Caucasus 2016 strategic drills. Alexei Pavlishak/TASS (Photo by Alexei Pavlishak\TASS via Getty Images)

FEODOSIYA, CRIMEA, RUSSIA - JANUARY 14, 2017: S-400 Triumf medium-range and long-range surface-to-air missile systems at the base of the Russian Southern Military District's air defence missile regiment. The regiment's personnel underwent re-training and held missile test launches as part of the Caucasus 2016 strategic drills. Alexei Pavlishak/TASS (Photo by Alexei Pavlishak\TASS via Getty Images)