Subject: Re: WSJ: Oil sanctions and the Ukraine war
Most previous sanctions were targeted at the long-term viability of Russia’s oil industry and only had limited effects on the country’s immediate cash flow. The Biden administration sanctioned Gazprom Neft and Surgutneftegas, the third- and fourth-biggest oil companies, but left Rosneft and Lukoil untouched. The two companies together produce roughly half of Russia’s oil.

There are other considerations, FYI...

Sanctions previously left Russia's largest oil companies like Rosneft and Lukoil mostly untouched to avoid destabilizing the global energy market. Policymakers feared that sanctioning major suppliers could cause a supply shock, leading to soaring oil prices that would inflict significant economic damage on the US and its allies.