Moody's, Standard and Poor's TNK-BP MOSCOW, Oct. 25 (UPI) -- International credit-rating agency Standard and Poor's gave a positive outlook to Russian oil company TNK-BP following a shareholder shakeup, the agency said. The agency, in a statement to Russia's state-run news agency RIA Novosti, said it gave a BBB- long-term rating to TNK-BP and an A-3 short-term for the joint venture. "The rating actions follow an announcement by Russian state-controlled oil company Rosneft OJSC that it had agreed in principle to purchase a 50 percent stake in TNK-BP from BP PLC for $17.1 billion in cash and 12.84 percent of treasury shares," the statement read. Rosneft also intends to buy another 50 percent of TNK-BP from the Russian consortium AAR for $28 billion. AAR -- Afla-Acess-Renova -- represented the Russian half of TNK-BP. Both sides of the venture were at odds over corporate direction. Moody's Investors Service said Wednesday it put the venture on a downgrade review following the announcements.