The Trump administration placed new sanctions on a Russian tycoon who the Treasury Department said is a prime financier of a troll farm that used social media to influence the 2018 midterm elections.

The Treasury Departmentís sanctions on Yevgeniy Prigozhin and six employees of the infamous Internet Research Agency targeted his assets, including three private planes and a yacht used by his family for vacations.

The Treasury Department said the newest sanctions are the first made under an executive order President Trump signed a year ago as a warning to countries interfering in U.S. elections. But it underscored concerns about foreign influence in the 2020 elections.