the real question about a possible iranian icbm is can one of their hypersonic glide vehicles survive re-entry at orbital speed? closest so far is the palestine-2 missile, which hits the air at mach 16. but speed and energy are an exponential relationship. so orbital speed is equivalent of mach 25 i think? which means nearly 2 and a half times the stress. it would probably have to have some kind of heat shield that detaches once the missile slows down to a survivable speed.
Canada