Russia's chief negotiator Deputy Foreign Minister Sergei Ryabkov said Tuesday that Iran and six world powers could agree parts of a text of an agreement on Tehran's nuclear program when they meet for a new round of negotiations in Vienna next week. The meeting, starting May 13 and lasting for about four days, is scheduled to begin drafting a final text. “For now there is no common (text) whatsoever. So if we get such an option, this would be a good result," said Ryabkov.