Russian Foreign Minister Sergei Lavrov said Friday that Russia and Iran had failed so far to reach an agreement on the establishment of a uranium enrichment joint venture, but "there is always an opportunity to reach an agreement", the Itar-Tass news agency reported.
"If all the elements of the negotiations are approved, including a moratorium on uranium enrichment... then the result will be positive." Itar-Tass quoted the minister as saying.
Lavrov emphasized that "We have so far not obtained the result, but we are working towards it."
The Iranian delegation is currently staying in Vienna for talks with the representatives of the European Union Troika, including Britain, Germany and France, as well as Mohammed ElBaradei, director-general of the International Atomic Energy Agency (IAEA), said the report.
Another report said the Vienna talks on Friday had failed to reach an agreement, but that the talks had been held in a constructive atmosphere.
Iran restarted enrichment activities last month, two years after voluntarily freezing the program during talks with the Europeans.
Tehran insists it wants uranium enrichment only to generate electricity, but many in the West fear that Iran will develop atomic weapons.
The UN Security Council is waiting until the end of next week's board meeting to decide on further action.

Russia says Iran ready to accept Russia's joint venture proposal
The Iranian leadership is prepared to accept Russia's proposal for upbuilding a joint uranium enrichment joint venture, State Duma Deputy Speaker Yuri Volkov said Friday at the end of his three-day visit to Iran with a parliamentary delegation.
During the visit Russian legislators held talks with officials at a number of key Iranian departments and agencies, including the foreign, oil and energy ministries, the Itar-Tass news agency reported on Friday.
Volkov said that the Russian delegation discussed with the Iranian side the most sensitive issues of political and economic cooperation. "The Bushehr nuclear power plant construction was the focus of attention," he said.
According to Volkov, the radicals in the Iranian leadership have been saying that "if Moscow refuses to finalize the Bushehr nuclear power plant construction, this would be tantamount to the ultimate betrayal of Iran's interests."
He pointed out that "these circles should not have the slightest chance of getting an extra argument in favor of Iran's self-isolation and open confrontation with the leading countries of the world."
About Iran's nuclear program Volkov said that Iranian parliamentary speaker Gholamali Haddad-Adel had told the Russian legislators the Iranians were very glad about the idea of a uranium enrichment joint venture project.
At the same time Iran has no intention to give up its right to produce uranium fuel on its own for peaceful purposes in strict compliance with the nuclear arms nonproliferation treaty, said the deputy speaker.