Ministers from OPEC+, which groups the Organization of the Petroleum Exporting Countries (OPEC) and allies led by Russia, meet on Sunday in Vienna.
Robust global oil prices this year and Moscow's growing use of a shadow tanker fleet have meant that much Russian oil has traded mostly above the Western oil cap price.
Moscow-based independent oil analyst Alexei Kokin said the oil prices declined from "very comfortable" levels to "just comfortable" levels.
Russia has budgeted the price of Urals, its flagship oil grade, at 4,788 roubles ($53.36) per barrel this year.
However, the share of energy sales in the federal budget proceeds - which used to exceed 50% of total budget revenue - has drastically declined.
Persons:
Alexander Manzyuk, Vladimir Putin, Alexei Kokin, Ronald Smith, Vladimir Soldatkin, Guy Faulconbridge, Jason Neely
Organizations:
REUTERS, Energy, OPEC, Organization of, Petroleum, BCS, Investments, Brent, Thomson
Locations:
Republic of Tatarstan, Russia, MOSCOW, Vienna, OPEC, U.S, China, Saudi Arabia, United States, Moscow