The United States steps up sanctions against Russia as Crimea approves a referendum to split from Ukraine. But aside from sanctions against powerful individuals in the Kremlin, contributor Dan Dicker tells TheStreet's Joe Deaux a round of sanction could come against publicly traded U.S. companies, most notably, Exxon Mobil, which has major operations in Russia. Dicker tells investors what it could mean for their stake in the oil company and whether this hurts Exxon more than Russia.

At the time of publication, Dicker was XXX, but positions can change at any time.

Dan Dicker has been a floor trader at the New York Mercantile Exchange with more than 25 years of oil trading experience. He is a licensed commodities trade adviser.

Dan is currently President of MercBloc LLC, a wealth management firm and is the author of "Oil's Endless Bid," published in March of 2011 by John Wiley and Sons.

Dan Dicker has appeared as an energy analyst since 2002 with all the major financial news networks. He has lent his expertise in hundreds of live radio and television broadcasts on CNBC, Bloomberg US and UK and CNNfn.

Dan obtained a bachelor of arts degree from the State University of New York at Stony Brook in 1982.

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