Nuclear talks between Iran and the world's six major powers have entered their most difficult phase, and all involved parties are working on new proposals submitted by Tehran.

Talking to journalists in Ufa, Russian Deputy Foreign Minister Sergei Ryabkov said ninety-five percent of the work has been completed, but there are still several steps to be taken.

Iran has offered some new suggestions to resolve the disputes in the nuclear talks, however, Western officials suggested they had heard nothing new from Tehran.

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