This is why an invasion of Iran is simply not necessary. Ahmadinejad is increasingly unpopular and this decision has made things worse for him.

Judicious use of sanctions whilst reducing the threat level so people turn to the moderates (as we all know, if a people feel threatened they will always embrace the demagogues rather than the rational voices) will save a great deal of grief in the long run.

Ahmadinejad is on shaky ground and pretty much the only thing keeping him in power is the external threat from the US. This regime is so far away from being able to produce a nuclear weapon, it's not even funny.