Nuke deal with Iran coming soon?

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I think I'm missing the strategy here, since there's a big difference between saying "we want the bomb" and "we want the bomb so we can blow up the world". I do think it's more then likely that Iran will become a stabilizing force in the region, but their nuclear program isn't likely to encourage that transformation. My biggest concern is that Iran has taken a hardline stance, while making moderate moves behind closed doors. The US has responded with a fairly hardline response until now, so by making this public, it will likely be percieved as weak American caving in to their demands