Ryabkov also said Russia is against the West's unilateral sanctions on Iran, calling this stance “unjust and inconsistent with the norms of international law.” He said Iran must be freed from all the international sanctions in case it agrees that its nuclear program will be under full control of the UN nuclear watchdog. “If such a deal takes place, then Iran must be fully freed from all the sanctions,” Ryabkov said.

Iran’s new plan is meant to bring about “the beginning of new cooperation” with its negotiating partners, Ali Bagheri, the deputy head of Iran’s Supreme National Security Council, said on Friday.

The plan expands on the initiatives presented during last year’s round of talks in Moscow, Bagheri said giving no details of the plan.

At a briefing after the talks Tehran's chief negotiator, Saeed Jalili, confirmed that the Iranian side has introduced its action plan but the group of six powers was not ready to react and asked for some time to study Iran’s ideas.

Jalili stressed that Iran has a right to enrich uranium and Tehran will use this for peaceful civilian energy needs. He added however, that the issues related to Iran’s cooperation with the international community may be discussed at further talks.

“We have offered this initiative and today we also announced out readiness to speak of these ideas and further study them. And these ideas may become the beginning of a new round,” Jalili said.

Meanwhile, EU foreign policy chief Catherine Ashton told reporters on Saturday the negotiations between Iran and six world powers showed that their positions "remain far apart on the substance."

Iran insists on its right to a peaceful nuclear program, but the P5+1 group says the country may be in fact on track to develop its own nuclear arms.

The international group, active since 2003, initially pushed for Iran to abandon its nuclear program.

But it softened its stance at the previous round of talks in Almaty in February, where it proposed to accede to Iran's right to nuclear research if Tehran manages to prove it would not enrich uranium to above 20 percent, which is sufficient for medical, but military purposes.

Another demand was to close a nuclear plant known since 2009 to operate in the village of Fordo in northern Iran.

Tehran's nuclear program resulted in international sanctions against the country, which left its oil-dependent economy flagging.

However, the public opinion in Iran is generally considered to be supportive of the nuclear program – which is a major factor for official Tehran's position, given that the country goes to the polls in June to elect a new president.