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Can there be a negotiated way out of the high-stakes stand-off between Iran and the West over the Islamic republic's nuclear ambitions? A new round of talks is planned for later this month but the basic facts have not changed: Iran's enrichment programme gets ever more sophisticated, international sanctions on Tehran bite deeper and the warnings from the West grow darker.

Stephen Sackur's guest on HARDtalk is a former Iranian negotiator on the nuclear issue, Hossein Mousavian. Does diplomacy have a chance?