The statement, made by Foreign Ministry spokesman Mikhail Kamynin, comes as UN nuclear inspectors are set to visit nuclear facilities where Iran claims to have enriched uranium.
Russian officials have said they will wait for a report on this visit before deciding on further steps.
The head of Russia's atomic energy agency, Sergei Kiriyenko, on April 20 defended the help that Russia is providing Iran to develop nuclear power. He denied suggestions that Russia's assistance in the development of Iran's Bushehr nuclear plant poses any danger of proliferation.
Also, a deputy secretary of Russia's National Security Council, Nikolai Spassky, on April 21 reiterated a proposal to have Iranian uranium enriched on Russian soil.
(AP, Reuters, Interfax)