especially considering the widespread support iran has within the region. cnn's nic robertson takes a closer look. >> reporter: the last time the u.s. went to war in the mideast, iraq, 2003, this is what it looked like. shock and awe. the dictator felled in weeks, followed by years of terrorist attack attacks and insurgency. the war in iran wouldn't be the same. it risks spreading to the whole region, and fast. here's why. iran will fight an asymmetric war to target the u.s. and its allies far from iran. shia militias in iraq could focus on israeli forces. hezbollah and shia militias in syria could target u.s. forces