No. Syria can't gas Israel with impunity because Israel and the US would respond to a WMD attack with a nuclear weapons strike from submarines, stealth bombers, artillery, or ballistic missiles. The SA-300 can't protect from all that. And if the A-rabs were so crazy and determined to destroy Israel that they are willing to have their own countries destroyed in a nuclear counter attack they would have done it a long time ago.
The only thing the SA-300 is good for is preventing the US/NATO and Israel from providing direct air support to the US taxpayer funded Al Qaeda foreign mercenaries that are attacking Syria. Since the Al Qaeda terrorist are getting their butts kicked by the Syrian Army the only thing that will save them now is direct intervention by the US/NATO and Israel.
You give a Muslim a child to hide behind and he will shoot. Convince these idiots your missile system will protect them and they will use it to attack.
Extremely destabilizing.
Yep. The Rebels need more then the McCain weapon of mass distraction. Although the ole half dead geezer can really pass some gas that might be considered dangerous. Fairly obvious that with the weapons embargo being lifted, the WWIII axis powers want to put a no fly zone over Syria so their Islamic terrorists can continue ethnic cleansing the Alawites and Christians. The Russians have no choice but to deploy the S-300's. For every action there is an equal and opposite reaction.
Fixed it for ya. Ain't nobody in dis admin gonna do a damn tang fo dos damn joooos.
There are no Arab countries with nuclear weapons. So there's a reason they haven't tried it.