Best part is it is never confirmed if Iran has the S400. Russian never sold the S400 to them by name. They have a few S300-PMU2 batteries and it is not 100% known if Russian sold any S300-PMU3 (which is essentially the S400) to them. But this guy seems to know that with certanity.
Irans Air Force is not a threat to the USAF - their most modern fighter seem to be the Mig-29.
Their air defense even with the assumption of having S400, does not have the ability to last more than the first leg of a US lead aerial attack. It will be a costly operation to the US in the first few days until at least the S300 batteries are taken out, but after that USAF will just crush them.
Iranian ground troops are experts in hybrid warfare. A ground invasion against Iran would be challenging but I doubt if the US will even want to go there.
Lots of people here cheering Iran does not understand what and who they are. Their real strength is TERRORISM. Iran has the capability to carry out terrorist strikes through a number of their proxy terror groups at will. If you guys are cheering for Iran, know that they are not the white knight you think they are.
His world view is simple, S-400 is better than F-22 therefore it can defend Iran indefinitely 
Hope you remember Qaher 313

Hope you remember Qaher 313




