Ukraine’s state-owned UkrOboronProm (UOP) reveals BM-21UM Berest 122-mm truck-mounted Multiple Rocket Launcher System (MLRS). Being the first MLRS technology developed indigenously in Ukraine, the BM-21UM project, which was funded privately by Shepetivka Repair Plant, makes no use of foreign-sourced components. The BM-21UM was developed as a replacement for the aging Soviet-era BM-21 Grad MLRS currently operated by the Ukrainian military. The UkrOboronProm to which Shepetivka Repair Plant belongs announced on its website on 1 April that the Berest has completed factory testing of and is ready to accept domestic and foreign orders
The BM-21UM is based on a KrAZ-5401NE 4×4 truck, which provides an operating range of 600km from two 165l fuel tanks and a top road speed of 90 m/h. It features a digital fire control system that can receive data in real time from UAS, counter-battery radars and other surveillance assets, according to UOP, which claims this increases system reaction times and accuracy. The vehicle is fitted with the SN-4215 navigation system from Arizona-Navigation, another essential element for effective artillery fires that was not standard for the BM-21. It is part of what enables the crew to lay the launcher onto its target automatically and facilitates the exchange of accurate information between units.
The capacity of the launch unit is increased to 50 rockets over the 40 carried by the BM-21. It is also provided with electronic actuators and two hydraulic jacks used to stabilise the vehicle whilst firing. The upgrade represents an improvement in the capabilities of 122mm rocket launchers: however, the inherent weaknesses of the design; increasing accuracy errors with range; complicated logistics requirements; and an extensive signature once fired, remain without upgrades to the rockets themselves. A greater amount of fire delivered on a target increases kill probability and enables fire distribution between different targets to be done faster and with greater efficiency.