Lets Get Real:
The Tehran Regime knows that the West does not have the stomach for another Middle East War, thus they will play this game, of giving ground and then stalling when the talks resume. The Obama Oval has made it clear that it favours Iran over Israel. The Powers have to get the fact that Iran wants the bomb, once Iran goes nuclear this will cause an arms race in the region, the oil powers can buy the technology and the know how to develop the bomb. Thus Iran must be allow 100% access to its nuclear sites, open and covert, and allow inspections any time, they can not be appeased, if the West follows that route there will be a WAR, it is just a matter of when.