Russian Eastern Military District's attack helicopters hold tactical flight training in Primorye Territory [Getty Images]

PRIMORYE TERRITORY, RUSSIA. FEBRUARY 18, 2016. Kamov Ka-52 attack helicopters during tactical flight exercises conducted by the Russian Eastern Military District at Vozdvizhenka alternate airfield. Yuri Smityuk/TASS (Photo by Yuri Smityuk\TASS via Getty Images) — see more

PRIMORYE TERRITORY, RUSSIA. FEBRUARY 18, 2016. Kamov Ka-52 attack helicopters during tactical flight exercises conducted by the Russian Eastern Military District at Vozdvizhenka alternate airfield. Yuri Smityuk/TASS (Photo by Yuri Smityuk\TASS via Getty Images)

TASS Yuri Smityuk