The U.S. imposed sanctions on a Ukrainian with ties to Russia, citing election interference.

The Trump administration imposed sanctions on a Ukrainian lawmaker Thursday for waging “a covert influence campaign” to undermine the presidential election after he disseminated information intended to hurt Joseph R. Biden Jr.

The Treasury Department accused Andriy Derkach, a member of the Ukrainian Parliament, of being “an active Russian agent for over a decade” and accused him of releasing “edited audiotapes” and “unsubstantiated allegations against U.S. and international political figures.”

While the announcement of the sanctions does not name Mr. Biden, the Democratic presidential nominee, it appears to describe recordings Mr. Derkach released of Mr. Biden talking to Petro O. Poroshenko, the former president of Ukraine, that Mr. Derkach claimed revealed corruption.

Mr. Derkach and other Russian agents “employ manipulation and deceit to attempt to influence elections in the United States and elsewhere around the world,” Steven Mnuchin, the Treasury secretary, said in a statement accompanying the sanctions. “The United States will continue to use all the tools at its disposal to counter these Russian disinformation campaigns and uphold the integrity of our election system.”