Only 16 months ago, the Russian billionaire Mikhail Fridman and his business partners happily sank $200 million into Uber. But now Fridman’s investment company, LetterOne, has pulled out of an even bigger U.S. investment to avoid resistance from an unexpected corner – the Trump administration. LetterOne’s L1 Energy unit recently walked away from a deal to buy Texas oil producer ExL Petroleum Management LLC for about $700 million over concerns the plan could be rebuffed by the Committee on Foreign Investment in the U.S., or CFIUS, the government panel that reviews deals for national security risks.