Malyuk, who had led the SBU since 2022, became known for overseeing successful operations against Russia and for purging the SBU of alleged Russian double agents, according to Laura Gozzi, a Kyiv-based reporter. The SBU is primarily responsible for internal security and counter-intelligence. Since the full-scale invasion, it has also played a significant role in assassinations and sabotage attacks inside Russia.

Khmara, Malyuk's replacement, has battlefield experience fighting the Russians in the occupied region of Donetsk. Both Malyuk and Khmara were involved in the preparation of the "Spider Web" attack last June, in which more than 100 Ukrainian drones struck air bases deep inside Russian territory.

The SBU's role has expanded significantly since the beginning of the war, taking on responsibilities beyond its traditional focus on internal security. This expansion reflects the evolving nature of the conflict and the need for Ukraine to defend itself against Russian aggression on multiple fronts. The agency's involvement in operations inside Russia highlights the increasingly blurred lines between conventional warfare and covert operations.

The reasons behind Malyuk's replacement remain unclear. However, the reshuffle comes at a critical time in the war, as Ukraine prepares for potential future offensives. Khmara's battlefield experience may be seen as a valuable asset in leading the SBU during this period. The appointment of an acting head suggests that the leadership change may be temporary, pending further evaluation of the SBU's performance and strategic direction.