Do some research on the range of EMPs. It's not as disastrous as you think.
http://www.doh.wa.gov/ehp/rp/factshe...41elecpuls.htm
Quote:
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Regardless of the method of delivery, experts agree that EMPs can be powerful enough to cripple electronic wiring and circuitry over a geographic area as large as several square miles,
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...and VERY high altitude EMPs (400-500km) would only have an impact on things that are big enough to act like antennas - like long-range electrical transmission lines.
If the Iranians or North Koreans ever got THAT crazy to try and launch a bomb on a missile, their countries would be turned to glass. They know this - and it's why Iran has been very careful to walk a fine line to placate the religious loonied while keeping them from being bombed back to the stone age.