If the United States were to declare war on Iran, it would simply move its nuclear supplies to an allied country, should defeat seem imminent, and hope that this other country would advance and spread the nuclear technology throughout the region, thus making the Middle East a nuclear "hot zone", and in turn force the US out of the region in order to prevent a nuclear war.

What the UN needs to do is not use all out war, or negotiations, but use a small group of soldiers to go incognito into Iran as scientists, or something along those lines, and have these people shut down the entire operations.

If terrorists organizations can sneak a few suicide pilots into the world's current superpower and deal a critical blow, what is there to stop the world's current superpower from doing the same thing to the terrorist organizations?

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When mankind has a question, nature usually has an answer.