Experts from the state corporation Rostec have developed a mobile version of the Citadel anti-aircraft artillery system on a vehicle chassis. Rostec stated that such a solution would enable the rapid transfer of the complex to places where protection against air attack is required, and would also provide mobile fire groups with greater capabilities to hit targets. Rostec presented a stationary version of the 30mm ZK turret in May at the International Security Forum. At the same time, several Telegram channels reported its use in the northwest region. "Fortress" uses shells with a controlled explosion, and a new fire control system allows less ammunition to be consumed. According to the developers, the system can shoot down various types of UAVs, as well as cruise missiles.