Two years ago, Turkey declared it would buy Russia’s S-400 missile defense system because the United States had dragged its feet in selling an American alternative.
CNN: Turkey bought Russian S-400 missiles designed to down NATO planes
A handout photograph taken and released on July 12, 2019, by the Turkish Defence Ministry shows a Russian military cargo plane, carrying S-400 missile defence system from Russia, during its unloading at the Murted military airbase (also known as Akincilar millitary airbase), in Ankara.