After Russia’s full-scale invasion of Ukraine, Russian oil came under sanctions, and little-known intermediaries using shell companies and a shadow fleet of tankers took over a large share of its exports. A network of companies linked to Azerbaijani businessmen Tahir Garayev and Etibar Eyyub became one of Rosneft’s main oil traders. They are now in a legal battle with former Rosneft executive Igor Soglayev, who sought to make money reselling Russian diesel in Brazil.