It is claimed to be the first footage of the use of OFZAB-500 with UMPK against Ukrainian positions in the Kupyansk direction

It is claimed to be the first footage of the use of OFZAB-500 with UMPK against Ukrainian positions in the Kupyansk direction. The bright flash at the very beginning is most likely the detonation process of the sprayed incendiary mixture. Source: Intel Slava Z