His comments underline how difficult it is for Russia to get its oil companies to freeze or cut output as part of a potential deal with Opec designed to support oil prices.
President Vladimir Putin told an energy congress on Monday that Russia was ready to join the proposed Opec cap, but did not provide any details.
"Why should we do it?" Sechin, known for his anti-Opec position, told Reuters in Istanbul on Monday evening, when asked if Rosneft, which accounts for 40% of Russia's total crude oil output, might cap its own output.
Sechin
