Russia has completed an elaborate air defense system in Syria that curbs the operational capabilities of both the United States and Israel, according to a report by the Washington- based Institute for the Study of War. The deployments throughout the conflict-ravaged country include variations of the advanced S-300 and S-400 systems in addition to other cutting-edge technologies. Moscow long ago exported such systems to Syria, however, they remained under the control of its own army. Only after the accidental downing in September by Syrian forces of a Russian reconnaissance plane, an incident the Kremlin blamed on Jerusalem which minutes earlier...