Moscow is counting on Iran to show "additional...

"Thus far, the parties" approaches on how to exchange nuclear materials, on what basis, when and in what amounts have not been brought to a common position," Sergei Ryabkov said.

"Nevertheless, we continue working and count on additional flexibility on the part of Iran, among others," he added.

He also said talks between the group of six international mediators on Iran"s nuclear issue - Russia, the United States, China, Britain, France and Germany - were making very slow progress, but Moscow still hoped that a common line would eventually be worked out.

"I would not exaggerate the differences... I am cautiously optimistic," he said.

Iranian President Mahmoud Ahmadinejad said earlier in the day his country was ready to play a "constructive and positive" role in breaking the stalemate over the nuclear fuel swap deal.

The UN-sponsored deal to supply nuclear fuel for a research reactor in Tehran proposes Iran ship out low-enriched uranium to be processed

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