Russia’s intervention in Ukraine signals trouble for OAO ‘s bid to buy Morgan Stanley ‘s oil-trading unit, according to people involved in the deal and others familiar with the U.S. government’s approval process. The proposed acquisition by Russia’s biggest oil producer, which is state-controlled, needs U.S. government approval by the Committee on Foreign Investment. CFIUS, a secretive government body, weighs national security risks and can sink deals. One person familiar with the deal said that if U.S.-Russia relations deteriorate further the companies would reassess whether they can proceed. Rosneft is paying several hundred million dollars for the business, the person familiar with the deal said, adding the companies are still months from seeking official U.S. government approval. A Rosneft spokesman said the companies “are working together according to an agreed schedule.” Morgan Stanley said it wasn’t deterred. “We intend to submit the transaction for all necessary regulatory approvals, and […]