The operational-tactical missile complex “Grim” was developed in the Pivdenne Design Bureau together with the Pavlograd Chemical Plant (PCHZ). The developers presented the “Thunder” as a high-precision weapon of the next generation, capable of providing a reliable shield of non-nuclear deterrence both for Ukraine itself and for any state.

In January 2018, it was reported that fire tests of the engine of the “Grim-2” rocket were carried out. A model of the complex was also shown in January 2018. And in August, it was shown at a parade on Ukraine’s Independence Day.

The missile complex can hit land and sea targets, depending on the installed warhead and guidance system.

Three main modifications were developed: “Thunder”, “Thunder-M” and “Thunder-2”. The first is used to destroy ground objects located at the tactical depth of the enemy at a distance of up to 280 km from the starting point. The latter is designed to defeat ground objects located at the tactical depth of the enemy up to 100 km from the starting point. The third is a mobile launcher with two surface-to-surface missiles on the chassis of a five-axle high-terrain truck.

Initially, OTRK “Grim” was designed to defeat single and group fixed targets from 50 to 280 km, but, according to the developers, the firing range can be increased to 450-500 km.