BP Prevails In Struggle For Company In Russia
BP reportedly prevails in long-running battle over Sidanko, Russian oil company in which it invested $484 million, and will regain control of key Siberian oil field it lost to Tyumen Oil in 1999 Sidanko bankruptcy auction; Tyumen reported agrees to buy Interros's 44 percent stake in Sidanko on terms that value company at about $1.5 billion; BP will retain its 10 percent stake and continue to run Sidanko, while Tyumen will own over 80 percent of company; deal also resolves conflict over undeveloped gas field in Irkutsk; BP will retain its 31 percent stake, while Tyumen and Interros will each have about 25 percent (M)