Ukrainian troops may be planning a chemical weapon attack on Russian soldiers, according to the Russian Embassy in the United Kingdom.

The embassy shared a video Friday on Twitter of drones and gas cylinders on a table. Some of the gas cylinders appear to be attached to the drones, and a man shows a refrigerator full of boxes containing the same gas cylinders.

A video published by Ukrainian military apparently shows them preparing to use #chemicalweapons, possibly #phosgene, prohibited by @UN CWC, against Russian military. Letters “OB” stand for toxic munition. This also explains why the gas cylinders need to be stored in the fridge. pic.twitter.com/eDmB43605g

— Russian Embassy, UK (@RussianEmbassy) January 13, 2023

"A video published by Ukrainian military apparently shows them preparing to use chemical weapons, possibly phosgene, prohibited by UN CWC [chemical weapons convention], against Russian military. Letters ‘OB’ stand for toxic munition. This also explains why the gas cylinders need to be stored in the fridge," the Russian embassy explained in its tweet.

Russia's Permanent Representative to the Organization for the Prohibition of Chemical Weapons (OPCW), Alexander Shulgin, stated in December that Moscow had information that US contractors were assisting in the preparation of "chemical provocations" in Ukraine.

Earlier, in June 2022, the Russian Ministry of Defense issued similar warnings, claiming that Kiev planned to stage a "false flag" attack involving chemical weapons in order to frame Russia and provoke confrontations with NATO.

Last year, Russian Deputy Foreign Minister Oleg Syromolotov said in April, as reported by Sputnik, that Moscow considers the threat of chemical terrorism by Ukrainian nationalists and the military to be very real.

"We consider very real the threat of chemical terrorism by fascist nationalists, operating under the patronage of the current Kiev regime, and units of the Armed Forces of Ukraine under their control," Syromolotov said.