The United States imposed sanctions on Friday against Russian businessmen, companies and officials, striking at associates of President Vladimir Putin in one of Washington’s most aggressive moves to punish Moscow for what it called a range of “malign activity,” including alleged meddling in the 2016 U.S. election.

The action, taken under pressure from the U.S. Congress, freezes the U.S. assets of “oligarchs” such as aluminum tycoon Oleg Deripaska and lawmaker Suleiman Kerimov, whose family controls Russia’s largest gold producer, Polyus.

The Treasury Department sanctions on seven Russian oligarchs and 12 companies they own or control, plus 17 senior Russian government officials, are likely to complicate U.S. President Donald Trump’s hopes for good relations with Putin.

“The Russian government operates for the disproportionate benefit of oligarchs and government elites,” Treasury Secretary Steve Mnuchin said in a statement.

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