Mark Rollins, the British CEO of Ukrnafta, the nation’s largest oil producer, is being let go after almost four years in the job.

Mark Rollins, the British CEO of Ukrnafta, the nation’s largest oil producer, is being let go after almost four years in the job. By terminating Rollins on April 30, Naftogaz asserts control of a company, where it controls 50% plus one share. During his tenure running Ukrnafta, Rollins turned the company into one of the top five taxpayers of the nation. But he ran afoul of Naftogaz over unpaid debts by the state oil and gas company. Responsible for two thirds of Ukraine’s oil production, Ukrnafta has 43 drilling rigs, 168 gas wells, 1,936 oil wells and 537 gas stations across Ukraine.