Ukrainian President Volodymyr Zelensky is warning his country’s citizens against interfering in foreign elections, calling it “unacceptable” under any circumstance.

Zelensky also rejected any possibility that Ukraine is involved in attempts to interfere in the 2020 U.S. presidential election. The comments came just a day after a top U.S. counterintelligence official said that a pro-Russian Ukrainian lawmaker was participating in a Kremlin effort to meddle in the November election.

“Once again, I assure our partners that Ukraine did not allow and will not allow itself to intervene in the future in the elections and thereby harm our trustworthy and sincere partnerships with the United States,” Zelensky said in a statement shared on Facebook on Saturday.