Brinksmanship in the nuclear talks

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While Iran and Washington seem to be on the same page regarding Iraq, things are a little rocky on the nuclear front. Iran missed an IAEA deadline (https://uk.news.yahoo.com/iran-fails-address-nuclear-bomb-concerns-iaea-200234184.html#VnMDJOT) and the US is applying new sanctions (http://www.gulf-times.com/opinion/189/details/407095/new-sanctions-on-iran-are-detrimental-to-an-agreement). This is likely just posturing as the negotiations hit a critical stage, but brinksmanship is a dangerous game to play (http://www.crisisgroup.org/en/regions/middle-east-north-africa/iraq-iran-gulf/iran/b040-iran-and-the-p5-1-getting-to-yes.aspx).
The reaction of Iran’s President Rouhani is perhaps the most interesting dimension to all of this (http://www.nytimes.com/2014/08/31/world/middleeast/iran.html). After carving out a position as a moderate, he has started publicly criticizing the US. Again, this is part of the bargaining process. But it is also a response to hardline criticism in Iran. It is very reminiscent of the maneuvering displayed by Hashemi Rafsanjani when he was president in the 1990s.