Lukoil has agreed to sell its international business to Switzerland-based commodity trader Gunvor, the second-largest Russian oil company said on Thursday, a week after the U.S. slapped sanctions on Russia’s top oil firms, making doing business with their international subsidiaries extremely complex and nearly impossible. Following the U.S. sanctions on Lukoil and Rosneft from last week, “as a result of Russia’s lack of serious commitment to a peace process to end the war in Ukraine,” Lukoil announced early this week…