The three-day visit could shape the direction of Western efforts to curb Iran's nuclear program, which Tehran says is only for peaceful purposes.
Iran Sunday declared itself optimistic about a UN experts' visit aimed at probing suspected military aspects of its nuclear work and lawmakers postponed debate on a proposed halt to oil flows to the European Union watched closely in energy markets.
A team of International Atomic Energy Agency (IAEA) inspectors began a three-day visit to try to advance efforts to resolve a row about nuclear work which Iran says is for making electricity but the West suspects is aimed at seeking a nuclear weapon.
Tensions with the West rose this month when Washington and the European Union imposed the toughest sanctions yet in a drive to force Tehran to provide more information on its nuclear program. The measures take direct aim at the ability of OPEC's second biggest oil exporter to sell its crude.
The Mehr news agency quoted Foreign Minister Ali Akbar Salehi as saying during a trip to Ethiopia: "We are very optimistic about the outcome of the IAEA delegation's visit to Iran ... Their questions will be answered during this visit,"
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