"Iran did not comply with and will not comply with UN Security Council resolutions as they do not have any legal force or grounds and were adopted in violation of international legal norms," envoy Ali Asghar Soltanieh said in Moscow.

"In our opinion, the UN Security Council, as an instrument used by Western states to pressurize Tehran, has reached a dead end," Soltanieh added.

He went on to say that Iran could help the international community "break out of this dead end."

The envoy also said Tehran was ready to realize a trilateral agreement reached in May 2010 between Iran, Brazil and Turkey that set out terms under which Iran would exchange in Turkey most of its 3.5 percent-enriched uranium for 20 percent-enriched fuel for use in a scientific research reactor in Tehran.

Earlier on Friday, the group of international mediators on Iran's nuclear program, known as the Iran Six, started two-day closed talks in Istanbul.

Though U.S. diplomats said they did not believe the talks would bring any breakthrough, the Iranian side expressed hope that the negotiations would be held in a "constructive manner."

The West suspects Tehran of pursuing a secret nuclear weapons program, which Iran strongly denies, insisting it needs atomic energy solely for civilian purposes.

Iran is currently under four sets of UN sanctions over its refusal to suspend uranium enrichment, including tougher financial controls and an expanded arms embargo, as well as an asset ban on three dozen companies and a travel freeze on individuals.