John Kerry joined Iran nuclear negotiations in Vienna as they entered a hectic final phase on Thursday night, fighting growing scepticism that they can be completed by the Monday deadline.
The US secretary of state was due to hold late-night talks with his Iranian counterpart, Mohammad Javad Zarif, in a last-ditch attempt to break the deadlock on unresolved issues.
But a former senior State Department official, involved in Middle East policy until only a few weeks ago, said it was now not “physically possible” to conclude a comprehensive agreement in the time remaining. He argued that an extension of up to six months might be necessary.
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