Russia has reportedly deactivated the S-400 anti-air system stationed at the Khmeimim Air Base in Syria in a move that frees up the skies for other countries including Israel and the U.S. to run air-operations in the region. So according to Debka File, which is a Israeli military intelligence website, Russian military sources as saying that the radar systems of the S-300 and advanced S-400 systems... 

Data captured by Russia’s S-400 system proves Israeli jets were responsible for the downing of the Russian plane, the Defense Ministry said, adding that the Syrian missile changed its course shortly before hitting the Il-20. Data gleaned from the S-400 air defense system deployed at the Russian Khmeimim air base in Syria’s Latakia province has revealed that the Syrian anti-air missile was, in...