"A video published by Ukrainian military apparently shows them preparing to use chemical weapons, possibly phosgene, prohibited by UN CWC [Chemical Weapons Convention], against the Russian military," the embassy said, posting the video.
"Letters "OB" stand for toxic munition. This also explains why the gas cylinders need to be stored in the fridge," Russian diplomats added, according to TASS.
According to the video, Ukrainian servicemen were planning to install those cylinders on strike drones.
MNA/PR