Russia's Deputy Foreign Minister Sergei Ryabkov said of Friday a nuclear deal with Iran is "within reach", the TASS news agency cited him as saying.
Iran and six world powers adjourned nuclear talks on Sunday for consultations in their capitals.
World powers have been negotiating in Vienna with Iran and the United States to revive the 2015 deal, under which Tehran agreed to curbs on its nuclear programme in return for the lifting of international sanctions.
Read more: US agrees to lift oil sanctions on Iran, says Tehran
Sunday's formal meeting comes more than a week after this round of talks resumed and is an indication that the talks are likely to be adjourned.
Since former US President Donald Trump pulled out of the deal and reimposed sanctions on Iran, Tehran has embarked on counter measures, including rebuilding stockpiles of enriched uranium, a potential pathway to nuclear bombs.
US President Joe Biden's administration aims to restore the deal, but the sides disagree on which steps need to be taken and when to defuse mutual suspicions and ensure full compliance.
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