On the supply side, recent speculation that Russia might be willing to cooperate with the Organization of the Petroleum Exporting Countries (OPEC) to curb output in support of prices was given a blow on Monday after the chief executive of Russian oil major Rosneft ruled out a Russian cut.
Refer to the input text as context and select the correct relationship between 'Rosneft' and 'Petroleum' from the available options.
Options: member of, product/material produced, publisher, parent organization