Saeed Jalili, secretary of the Supreme National Security Council who acts as Iran's chief nuclear negotiator, will hold informal talks with European Union foreign policy chief Catherine Ashton in Istanbul on Tuesday, MNA reported.
Ashton leads the major powers (the five permanent members of the UN Security Council and Germany) in nuclear talks with Iran.
A spokeswoman for Ashton said on Monday that the meeting "is part of continuing efforts to engage with Iran, led by the High Representative, and in line with the understandings reached at the negotiating round in Moscow in June."
"While it is not a formal negotiating round, the meeting will be an opportunity to stress once again to Iran the need for an urgent and meaningful confidence building step and to show more flexibility with the proposals... tabled in Baghdad (on May 23 and 24)," she stated.
The latest round of high-level talks between Iran and world powers was held in Moscow on June 18 and 19.
After the Moscow talks, both sides agreed to hold expert talks, the most recent round of which was held in Istanbul on July 24.