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Worries over corporate exposure to Russia
Possibility of sanctions a concern for multinational companies active in the country such as Siemens, BP, Volkswagen, ExxonMobil
US STOCKS-Wall St sells off as Ukraine-Russia tension rises
* Gold and oil climb as Ukraine tensions spur safety bids
Gas prices leap on Russia’s Crimea move
Global benchmark prices of wheat and corn, both major exports of Ukraine, also rose, as did oil prices
