during khan's tenure as a tnk-bp executive director, tnk-bp became russia's third largest oil company and globally a top ten private oil producer. without a majority stakeholder in the company to dictate choices, by 2008, bp executives were in conflict with aar over tnk-bp's strategy to internationalise the business. after several ongoing lawsuits, issues between aar and bp were compounded in 2010, after khan and fridman resisted bp's push to do business with the state-owned oil company rosneft in russia, contrary to their shareholder agreement. by 2011, khan's net worth was estimated at $9.6 billion, which placed him at 92 on the "forbes" billionaires list, also ranking him as the thirteenth wealthiest person in russia. khan was appointed executive director of tnk-bp ltd. in january 2011.