"Experts will finalise details by the end of June," Lavrov said, noting "quite achievable" results.
"One can say with relative certainty that we have reached an agreement in principle at the ministerial level. It will be put on paper in the coming hours or throughout the day," he said, adding that the details of the agreement would be announced by EU foreign policy chief Federica Mogherini and Iranian Foreign Minister Mohammad Javad Zarif.
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