UPDATE 1-Rosneft's Sechin says Saudi Arabia, U.S. and Russia call shots on oil markets
(Adds detail, quotes) MOSCOW, June 21 (Reuters) - Igor Sechin, the head of Russia's top oil producer Rosneft, said on Tuesday that Saudi Arabia, the United States and Russia were the three main players on global oil markets, dismissing again OPEC's role as a regulator. He told Rossiya
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