Rosatom was ready to provide Tehran with new reactor fuel and process spent rods.
Iran and six world powers have agreed the framework of a potentially historic deal aimed at curbing Tehran's nuclear drive.
US President Barack Obama told Israeli Prime Minister Benjamin Netanyahu that a framework nuclear deal between Iran and world powers represented "significant progress."
German Chancellor Angela Merkel said the international community had never "been so close to an agreement preventing Iran from having nuclear weapons".
All-night nuclear talks between Iran and major powers made "significant progress," but there is no "final result yet."
Russian Foreign Minister said early that global powers had reached an agreement in principle on "all key aspects" of the outlines of an Iranian nuclear deal.
The biggest importer of Kazakh grain for the 2013-2014 year was Iran with its 1 255 000 tons of grain, followed by Uzbekistan with its 885 400 tons, Azerbaijan (815 600 tons), Russia (658 600 tons).
US Secretary of State John Kerry saidhe and his global counterparts were going to work deep into the night seeking to resolve the remaining "tricky issues".
Iran has asked Turkey's top diplomat in Tehran to explain remarks by President Recep Tayyip Erdogan heavily critical of Iran's role in Yemen and the region.
US Secretary of State John Kerry said that talks on Iran's disputed nuclear programme have made progress, but there were still "important gaps" to overcome.
Israeli Prime Minister Benjamin Netanyahu arrived in Washington for a "historic" quest to stop a "bad" international nuclear deal with Iran sought by the US.
US Secretary of State John Kerry will meet next week with his Russian and Iranian counterparts seeking an end to fighting in Ukraine and to advance a nuclear deal with Iran.
The United States and Iran have a "mutual interest" in defeating the Islamic State group but the long-time foes are not cooperating to do so.
The European Union's foreign policy chief said an Iran nuclear deal was "at hand" and urged different sides to show political will ahead of a new round of talks.
Russia voiced confidence that world powers and Iran would be able to reach a comprehensive accord over Tehran's disputed nuclear programme by a June 30 final deadline.
Iranian Foreign Minister Mohammad Javad Zarif and top US diplomat John Kerry will meet in Geneva this week for talks on Tehran's nuclear programme.
Secretary of State John Kerry stressed to his Iranian counterpart that the US aimed to meet a late March deadline for a deal reining in Iran's nuclear programme.
Iran warned the US Congress against imposing new sanctions, saying this would lead to a collapse of negotiations over Tehran's controversial nuclear programme.
US President urged Congress not to impose new sanctions on Iran over its disputed nuclear program, threatening to veto any such legislation that lands on his desk.
Germany's foreign minister said no more deadlines must be missed in the Iran nuclear negotiations which had entered "a decisive phase."