Washington (CNN) The Trump administration announced new sanctions Friday related to Russia's occupation of Crimea and ongoing violence in eastern Ukraine, just days ahead of a congressionally mandated deadline for the implementation a separate, broad array of Russia-related sanctions.

In a press release, the Treasury Department said it was designating 21 individuals and nine entities under existing authorities, including Russian government officials and Russian companies connected to projects in the disputed Crimean Peninsula.

The agency also sanctioned senior leaders of two Ukrainian separatist groups, the Donetsk People's Republic and the Luhansk People's Republic, as well as people and entities alleged to have provided them with material support.

"The US government is committed to maintaining the sovereignty and territorial integrity of Ukraine and to targeting those who attempt to undermine the Minsk agreements," Treasury Secretary Steve Mnuchin said in a statement. "Those who provide goods, services, or material support to individuals and entities sanctioned by the United States for their activities in Ukraine are engaging in behavior that could expose them to US sanctions."

By Monday, the administration must implement a set of additional sanctions meant to punish Russia for its interference in the 2016 US election. Those sanctions were mandated by Congress in a bill passed last year, which President Donald Trump vocally opposed but signed into law nonetheless.

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