British-Russian oil joint venture TNK-BP Ltd. said Wednesday it has appointed Jonathan Muir as chief financial officer and Didier Baudrand as executive vice president of its downstream division as well as executive director of the company.

Jonathan Muir has been acting CFO of TNK-BP since August last year, when James Owen resigned due to mounting pressure from shareholders.

TNK-BP, Russia's third-largest oil producer, is owned on a fifty-fifty basis by U.K. oil major BP PLC (BP) and a group of Russian billionaire businessmen.

Last year, the shareholders got entangled in a fierce dispute over control and management of the company.

Didier Baudrand joins the company from BP, where, until recently, he held the position of senior vice president of the company's refining and marketing special projects, TNK-BP said.

"The new appointments mark a further step in completing our senior management team, which combines the strength of our existing cadre with new experience," said TNK-BP's acting CEO, Tim Summers.

Summers took over as CEO Dec. 1, when BP-appointed Robert Dudley was forced to step down according to a shareholder agreement signed in September.