At the request of Britain, the UN Security Council plans to discuss last week's attack on an oil tanker off the coast of Oman.
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The discussion is scheduled to take place behind closed doors on Friday, but the 15-member body is not expected to take any action.
Britain told the Security Council on Tuesday it was "highly likely" that Iran used one or more drones to carry out the tanker attack last week, which killed two crew members – a Briton and a Romanian.
"There's a lot of conflicting information. A 'highly likely' analysis, which we totally reject. We need to establish facts ... we don't need to rush to any conclusions or actions without having proof of what has happened," deputy Russian UN Ambassador Dmitry Polyanskiy told reporters on Wednesday.
Tehran has denied any involvement in Thursday's attack on the Mercer Street – a Liberian-flagged, Japanese-owned petroleum product tanker managed by Israeli-owned Zodiac Maritime.
The United States and Britain said on Sunday they would work with their allies to respond to the attack.
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