ArmInfo. Despite the incompatibility of Russian S-400 systems with 

NATO armaments, Turkey will be able to deploy them in regions where  restrictions imposed by the NATO leadership apply. In particular, on  the border with Armenia, Greece and the Aegean coast, – Bloomberg  reports with reference to an anonymous source in Turkey.  According  to the information of a high-ranking Turkish official, Ankara is  ready to pay $ 2.5 billion for the delivery of Russian S-400 systems.  Two batteries of complexes will be delivered to Turkey in 2018. The  same number of complexes are planned to be built later in Turkey  itself.  Rosoboronexport refrained from commenting.

Turkey was ready to purchase  Russian S-300 SAMs in the past year,  but the deal did not take place because of NATO's position. Ankara  was also forced to abandon plans to purchase such systems from China  under pressure from Washington. 

Russian anti-aircraft missile system of large and medium range, S-400  surface-to-air missile system, codified by the US Defense Ministry  and NATO – SA-21 Growler, is designed to destroy all modern and  promising air and space attack weapons.