 Russia admits using prohibited chemical weapons on Ukrainian troops. Russia's Black Sea Fleet's 810th Naval Infantry Brigade wrote a message on Telegram about a radical change in tactics, which includes dropping K-51 grenades from drones onto enemy positions. They said this tactic had been adopted to smoke them out from their 45 positions and then strike fleeing troops with combined weapons. The Russian K-51 aerosol grenades are filled with CS gas, which is a type of tear gas used for riot control according to the think tank the Institute for the Study of War. As the Institute for the Study of War notes, K-51 aerosol grenades are filled with irritant chloro-benzyl malanonitrile gas, a type of tear gas used for riot control also known as a riot control agent. The Chemical Weapons Convention prohibits the use of riot control agents as a method of warfare and Russia has been a state party to the Chemical Weapons Convention since 1997. The Institute for the Study of War previously observed that Russian forces used K-51 grenades against Ukrainian positions in Donetsk, Oblast, in November 2022.