Russia is seeking written guarantees from Washington that US sanctions imposed on the country do not impede its ability to trade with Iran, a move that risks complicating efforts to revive the 2015 nuclear accord.
Moscow made the demand as western officials said they were close to a deal with Iran that would bring the US back into the agreement that Tehran signed with world powers. This would mean the Islamic republic limiting its nuclear activity in return for sanctions relief.
Russia, a signatory to the accord along with the UK, France, Germany and China, has been involved in the negotiations in Vienna aimed at saving the deal.
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