Zelensky fired Ivan Bakanov, chief of the Security Service of Ukraine, and Iryna Venediktova, the country’s prosecutor general, after it was revealed that many in their departments were collaborating with Russia.

More than 60 employees in both offices “remained in the occupied territory and are working against our state,” Zelensky said in a press release.

“Such an array of crimes against the foundations of the national security of the state and the connections detected between the employees of the security forces of Ukraine and the special services of Russia pose very serious questions to the relevant leadership,” Zelensky said. “Each of these questions will receive a proper answer.”

“As of today, 651 criminal proceedings have been registered regarding treason and collaboration activities of employees of prosecutor’s offices, pretrial investigation bodies, and other law enforcement agencies,” Zelensky added.