Russian PM Vladimir Putin has warned against military action targeting Iran or imposing new sanctions to curb its nuclear programme.
Iran's latest proposals on its nuclear ambitions have brought diverging views from the US and Russia.
Earlier, a US official told the BBC that Washington was unhappy with the proposals, submitted on Wednesday.
Correspondents say parties involved are making their positions clear ahead of the UN General Assembly this month.
President Barack Obama has given Tehran until the end of September to respond to his friendlier overtures or face new sanctions.
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