'Thunder') is a Russian unmanned combat aerial vehicle (UCAV) being developed by Kronshtadt.

A full size mockup of the Grom UCAV was unveiled at Army-2020 by Kronshtadt.

[1][2] "Grom" is being designed to operate in conjunction with fighters such as Su-35 and Su-57; according to main designer of Kronstadt, the main task of this UCAV is to save the lives of pilots and piloted aircraft themselves.

[4] The Grom drone will be capable of not only operating with its own weapons, but also controlling a swarm of 10 units of Molniya strike drones launched from another carrier.

[5] During Army-2022 forum Kronshtadt representatives confirmed that government contracts for the development of the drone were signed, and it was at the stage of preliminary design.