The options are always the same: diplomacy, economic incentives or sanctions, or military action be it overt or covert. Usually, a combination of all three.
Diplomacy is not synonymous with weakness. Diplomacy often entails allowing the other party to take enough rope with which to hang themselves. (I.E.: The Cold War ending as a result of the Soviets inability to match us economically during an accelerated arms race.) Personally, I think that eventually Iran will come around and the theocracy will fall as a result of domestic insistence.
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