The S-300 has had a lot of modifications but let’s face it it’s not the newest.
So which variant is it? But what ever variant it is, the entire system is tied into the Russian Command and Control in Russia, making the system operated by Russians in Russia. The Syrians just follow orders and turn the knobs and flip switches as they are told.
The system also has Russian IFF so that Russian planes will not be shot at again.
He meant it’s an old system, so the modifications can only go so far. I think. It’s the latest modification but on an old system.