In November 2015 , the deployment of S-400 was reported in Syria , along with the contingent of Russian troops and other military hardware in the course of the air campaign conducted by the Russian forces on the side of the Syrian government . However , those reports were refuted by Russia . On 25 November 2015 , the Russian government announced it would deploy S-400s in Syria in response of the downing of its SU-24 jet by Turkey . On 26 November 2015 , it was reported the deployment of S-400 air defence systems to Syria is being carried out . The first S-400 unit was deployed at the Khmeimim Air Base in Latakia Governorate
downing of its SU-24 jet
2015 Russian Sukhoi Su-24 shootdown
S-400 missile system