This week’s discussions may lead to an initial agreement but any deal unlikely to be made public until details are fine-tuned in June, says senior European official

Even if a deal is agreed during this week’s international negotiations on key elements of Iran’s nuclear programme, much of it may be kept secret until a final deadline at the end of June, a senior European official has said.

The US secretary of state, John Kerry, and his Iranian counterpart, Mohammad Javad Zarif, flew back to the negotiations venue in Lausanne, Switzerland, on Wednesday and are due to resume talks on Thursday, six days before their deadline to reach a framework agreement.

That date was laid down by foreign ministers last November, after a previous deadline was missed, but European officials sought to play down expectations over what could be achieved in the next few days.

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