Turkey Buying S-400 Air Defense System from Russia Would Be ‘Concern’ for US

"There was a media report that was incorrect, they have not bought the S-400 air defense system from Russia. That would be a concern, were they to do that, but they have not done that," Dunford said at the Aspen Security Forum in Colorado, Sputnik reported.

The S-400 Triumph is Russia's next-generation mobile surface-to-air missile system that can carry three different types of missiles capable of destroying aerial targets at a short-to-extremely-long range. It is designed to track and destroy various types of aerial targets, from reconnaissance aircraft to ballistic missiles.

As of today, Russia only concluded a deal on supplying the S-400 system with China, and the talks are underway with Turkey and India. On Tuesday, Turkish Defense Minister Fikri Isik said that the negotiations regarding Russia's delivery of S-400 air defense systems to Turkey have reached the final stage.