In November 2015, it was reported S-400 will be deployed to 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 claims were refuted by Russia. On 25 November 2015, the Russian government announced it would deploy S-400s in Syria as a response to the downing of its Su-24M jet by Turkey. On 26 November 2015, deployment of S-400 air defense systems to Syria was underway. The first S-400 unit was activated at the Khmeimim Air Base in Latakia Governorate.