After the 24 November 2015 shootdown of a Su-24M , a S-400 defensive missile system was installed , allowing Russia to defend the air space from Southern Turkey to Northern Israel . At the end of January 2016 , Sukhoi Su-35 fighter jets started to be deployed . In February 2016 , one Tupolev Tu-214R was reported to have been deployed
24 November 2015 shootdown
2015 Russian Sukhoi Su-24 shootdown
Khmeimim Air Base