FILE - This March 22, 2013, file photo, shows exterior of the Internal Revenue Service building in Washington. As the United States attempts to punish Russia for its actions in Ukraine, the Treasury Department is deploying an economic weapon that could prove to be more costly than sanctions: the Internal Revenue Service. This summer, the U.S. plans to start using a new anti-tax evasion law that will make it much more expensive for Russian banks to do business in America. (AP Photo/Susan Walsh, File)

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