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Being the biggest oil company in Russia, Rosneft is also the largest publicly traded company in the world based on its hydrocarbon production volume. BP holds a 19.75 % share in Rosneft which makes it a beneficiary to a broad range of existing and future projects in Russia, a country that has huge hydrocarbon resources.
Saudi Arabia is by far the biggest producer in the OPEC club and the opinion of its oil minister, pretty much rules the actions of OPEC. If OPEC members decide to cut their production, but Saudi Arabia refuses to play ball, the resolution to cut would have no impact on oil prices, and thus be a worthless exercise.