State-controlled Rosneft strengthened its position as the nation's top oil company on Tuesday, announcing that it would buy nearly 600 filling stations and other facilities that once belonged to the bankrupt Yukos oil company.

Rosneft said it would pay just over 21 billion rubles ($815 million; 606 million euros) for the filling stations and oil product terminals to Yuniteks -- the company which purchased them at liquidation auctions earlier in the year.