"The cost of oil exports decreased both due to lower prices and because of the embargo and price ceiling by a host of countries on Russian oil and oil products," the central bank said in a report.
It said the price of Brent crude averaged $81 a barrel in the quarter, down 18% year on year.
"Russian oil prices have declined more strongly," the
bank said. "The discount for Russian oil to Brent crude has
widened, including because of the price ceiling."
It added, however, that a drop in oil exports to the
European Union had been offset by an increase in sales to Asian
countries seeking oil at a discounted price.
As the price of Russian oil has dropped below the
Western price cap, large volumes are now not subject to any
restrictions, the bank said.
(Reporting by Elena Fabrichnaya; additional reporting by Caleb
Davis; Writing by Alexander Marrow; Editing by Kevin Liffey)