Russia Sends S-300 Missiles To Iran

http://www.jpost.com/Defense/Report-Russia-to-supply-Iran-with-S-300-anti-aircraft-missiles-325843
If it's the full bird and not some modified version, it can operate in any combat environment and locate, identify and knock down any American stealth aircraft...

It is a decidedly potent system that's been updated and modified since the late 1970's . The question is which version is Iran getting? There are quite a few variants in that system and I would question if Russia is actually sending the ones with the ABM/Stealth killer block upgrades, but that would be a good question to put to Mr. Putin next time we see him.