Russian billionaire Oleg Deripaska on Monday requested a U.S. federal judge lift sanctions against him, claiming the Treasury Department has failed to prove he is an agent of Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE's.

The response comes after Treasury’s Office of Foreign Assets Control (OFAC) sanctioned Deripaska last year over Russia’s “worldwide malign activities,” including occupying Ukraine's Crimean Peninsula, supporting President Bashar Assad of Syria by supplying weapons and attempting to undermine Western democracies.

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The Russian billionaire later sued the U.S. over the sanctions, claiming he lost $7.5 billion after banks withdrew credit and other businesses refused to work with him. Deripaska filed documents on Monday stating that a redacted version of U.S. Treasury records determined that he did not act on the Kremlin's behalf.

“OFAC provides no explanation as to how it determined that support for a project associated with a specific individual is the equivalent of acting for or on their behalf,” according to a filing in a Washington federal court.

The filing says that eight out of nine paragraphs in an OFAC memo backing up the basis for the sanctions were redacted and that Deripaska has “alternative means to learn of the reasons” for the penalties. The Russian billionaire claimed in his filing that the sanctions could be imposed only in response to a national emergency, but the U.S. has yet to make such a declaration.

The Treasury Department did not immediately respond to a request for comment from The Hill.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinThe Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' MORE and OFAC asked a judge to throw out Deripaska’s lawsuit in August, claiming Deripaska cannot argue his constitutional right to due process was violated because he’s a foreign national.

Deripaska, the founder of aluminum producers En+ Group and United Co. Rusal, was one of several prominent oligarchs sanctioned after a law was passed to retaliate against Moscow for interfering in the 2016 U.S. presidential election. He is currently worth about $2.9 billion, according to the Bloomberg Billionaires Index.