To everything prior to the below comment, What can I say, but that we disagree.
Sanctions are good. Airstrikes work too.
'If you want to have a defense system that includes the same weapons we have, we will attack you'...
If you the U.S. got rid of all it's nuclear weapons, it'd have a leg to stand on. And that's the problem. No one pays attention to the US on this if they are prepared to face the sanctions, because no matter the justifications behind it, in the end, everyone understands there is a rank hypocrisy in demanding other nations never develop nuclear weapons, while keeping theirs.
By the way - I don't particularly care for Iran getting a hold of Nuclear weapons, just as Pakistan is a worry, because of the potential for religious extremists getting a hold of them (because religious extremists may not care about the threat of mutually assured destruction).