Outside the EU, Russia's top crude oil export markets are China, India and Turkey.
Some Russian oil will continue to flow into the EU via pipelines as the ban excludes some landlocked refineries.
read moreHOW MUCH DOES THE EU DEPEND ON RUSSIAN CRUDE IMPORTS?
Russian oil exports by destinationGermany, the Netherlands and Poland were the top importers of Russian oil in Europe last year, but all three have capacity to bring in seaborne crude.
Russian crude oil flows, based on loading data in August, rose month-on-month to Italy and the Netherlands, where Russian oil major Lukoil owns refineries, according to the IEA.