"On October 1, three battalion sets of S-300PM systems of eight launchers each were delivered to Syria," a military source told the agency.
"These systems were previously deployed at one of the Russian aerospace forces’ regiments which now uses the S-400 Triumf systems. The S-300 systems underwent capital repairs at Russian defense enterprises, are in good condition and are capable of performing combat tasks," he said.
The source added that the systems were provided free of charge, along with 100 surface-to-air guided missiles for each battalion, 300 in all.