Richard Haass discusses progress made in the Iran nuclear negotiations
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Iran nuclear talks: Sceptic Richard Haass 'surprised'

A potentially historic deal has been agreed on limiting Iran's nuclear programme. After eight days of negotiations in Switzerland, Iran and representatives of six world powers unveiled a framework for curbing the country's nuclear capabilities for at least a decade.

A final accord still needs to be reached by the end of June and President Obama stressed the need for verification but he also hailed this as a good deal.

Council on Foreign Relations President Richard Haass, a sceptic of the Iran negotiations, says he is pleasantly surprised by this deal which is more substantive than he expected. He spoke to the BBC's Katty Kay.

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