CS gas is not lethal but causes sensory irritation including to the lungs, skin and eyes. Both Russia and Ukraine have accused each other of using chemical weapons in the three-year-long conflict.

openly boasted of using CS gas in attacks on Ukrainian troops, posting a video of gas canisters being dropped by drones to smoke out Ukrainian troops from their positions, the Kyiv Post reported.

A thick haze of o-Chlorobenzylidene Malononitrile, more commonly known as CS gas, fills the air. Marines with Deployment Processing Command, Reserve Support Unit-East (DPC/RSU) and the 26th Marine ...