In 2009 Russia imported 42,750 barrels per day of crude oil.
Demand is growing as Russia modernises
See this press release from December 18th:
Russia, Iran to sign $700 mln oil contract - TV | World | RIA Novosti
"Tatneft, one of Russia's top ten crude oil producers, and the National Iranian Oil Company (NIOC) plan to sign a $700 million contract on Sunday on the extraction of heavy oil at the Zagheh oilfield in south Iran, the Iranian Press TV channel reported.
Under the contract, the Zagheh oilfield in the Bushehr province will produce 7,000 barrels per day of heavy crude in the first phase of its development. The output will be increased to 55,000 bpd in the second phase, Press TV said"
That one contract guarantees Russia its current oil import requirements. No wonder Russia are so against oil sanctions against Iran.
The quantities are not a lot in the general scale of things, but it does give Russia a degree of stability