The two previous round of talks on drafting the final agreement were held in Vienna and New York, respectively.
The Iranian deputy foreign ministers Seyed Abbas Araqchi and Majid Takht Ravanchi as well as the foreign ministry`s director general for political affairs Hamid Baeedinejad started the third round of talks in Vienna on Tuesday.
Iran and the G5+1 agreed to resume the fourth round of talks on May 20.
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