"Ashton has received an open invitation from Zarif to travel to Iran whenever she wants," Abbas Araqchi, the deputy negotiator in talks on Iran's disputed nuclear programme, said without giving any dates for the proposed trip.
Iran and world powers agreed yesterday on how to implement a landmark deal on containing Tehran's nuclear programme, but it must still be approved by each country before it can take effect.
"The negotiations were carried out in the atmosphere of mutual understanding and we found solutions for all the three points of disagreement, but the capitals should decide whether they accept or reject the solutions," said Araqchi.
Two days of talks between high-level Iranian and EU negotiators ended in Geneva yesterday with "very good progress on all the pertinent issues," said Michael Mann, a spokesman for EU foreign policy chief Catherine Ashton.
Ashton represents the so-called P5+1 group of world powers - Britain, China, France, Germany, Russia and the United States - in the decade-long nuclear negotiations with Iran.
