Iran have one of the best air defenses in the Middle East. They have Russian Rezonans-NE VHF radars. And they have Russian and their own air defense systems. Try checking out the specs of the Bavar-373 and Khordad-15 for example. Those are their equivalents of S-350 and S-400 system. They also have their equivalent of the Buk, the Raad SAM, and operate the Russian Tor SAM. The only thing they lack is ABM defense.
But yes their airforce is utterly obsolete.
Didnt seem to work out as IDF hit their air defense site near nuclear site after Iranian TikTok strike.
Now regarding the general discussion here:
There isnt any nation state on Earth that can fend off symmetric warfare against US let alone US+Israel bar China which in itself wouldn't be a walk in the park either, otherwise there would be no rebel province right now. And China knows it and its bidding its time and its confident in its rate of progress. Thats why there are many bait attempts to incite China into a conflict, theyre playing it right thats why US is desperate to pivot to Asia pacific but keeps getting caught up in other conflicts.
It will be smart of Ira to avoid wider war in the conflict. It will be playing right into Netanyahu's hand by getting US into conflict with Iran, they know it and theyre baiting hard. Why Iran gets flak is because of big gung ho statements coming out of them and then they cant back those up. Not wise to talk big if you dont carry a big stick.
Everyone thinks knee jerk reactions are great, because they make for great tweets, but that's not how it works in real life.
Israel gets unconditional US support because its nurtured that influence over decades of hard work, economic value creation and putting competent enough people in right places at right times in media, economy and politics to serve their interests and they've played a long and smart game and mostly done it below the radar of public. Theyre just playing the game more smartly. India us attempting to the same but theyre simply not that competent in this meta game as of now but may or may not eventually get there.