The Trump administration plans to lift sanctions on companies owned by Russian oligarch Oleg Deripaska after he significantly reduced his ownership stake in them.

The Treasury Department announced Wednesday that it would lift financial sanctions on Deripaska’s aluminum company, United Co. Rusal, as well as En+ Group plc and JSC EuroSibEnergo in 30 days, after Deripaska agreed to reduce his ownership stake in each of the companies to below 50 percent.

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Deripaska, a billionaire aluminum magnate with close ties to Russian President Vladimir Putin, will remain sanctioned and his property blocked.

“Treasury sanctioned these companies because of their ownership and control by sanctioned Russian oligarch Oleg Deripaska, not for the conduct of the companies themselves,” Treasury Secretary Steven Mnuchin Steven Terner MnuchinHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Treasury: Trump's payroll tax deferral won't hurt Social Security Treasury sanctions individuals, groups tied to Russian malign influence activities MORE said in a statement.

“These companies have committed to significantly diminish Deripaska’s ownership and sever his control. The companies will be subject to ongoing compliance and will face severe consequences if they fail to comply,” he continued.

The sanctions on Deripaska and his companies were imposed in April under a law passed by Congress to punish Russia for interfering in the 2016 presidential election, in addition to other malign activities.

The sanctions will be lifted in 30 days, according to Treasury, but Congress could still block the move.

In a joint statement later Wednesday, the leaders of the Senate Intelligence Committee noted that the agreement between Treasury and Deripaska “does not change the fact that Mr. Deripaska, his employees, and his companies work at Vladimir Putin’s behest and operate as de facto representatives of the Russian government.”

Sens. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) and Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.) added that the deal “will require constant monitoring to ensure that neither Mr. Deripaska nor the Russian government violate the terms of the agreement” and insisted Congress will “hold accountable those who would violate” the sanctions.

The Trump administration separately on Wednesday unveiled new sanctions on Russian intelligence officers for election interference and the nerve agent attack on an ex-Russian spy in Britain.

-Updated 4:50 p.m.