S-300 issue

So nations are not allowed to even defend their skies? There is a good chance Russia gave Iran the system just like how America use to give the Afghans weapons against the soviets. There isn't much anyone can do about it but complain. Russia will just say it didn't gave Iran the weapons etc and play it off. If Iran really possessed S-300 system, the Israeli really have to buck up their SEAD capabilities in order for them to penetrate the Iranian skies. Anyhow it can swing either way whether they have it or not.