Lukoil's Board of Directors has appointed Vadim Vorobiev as acting president, sources close to the company told RBC. Vadim Vorobiev has been working at the company for over 20 years, and until now he held the position of the first executive vice president and was a member of the management board. Earlier, Vagit Alekperov, the company's founder, resigned as president of the company and the board of directors.