Overview

• The OPCW has verified the presence of CS gas, a riot control agent, in samples from Ukraine's conflict zones.
• The samples, collected near Illinka in the Dnipropetrovsk region, included a grenade and soil from a trench.
• The use of CS gas in warfare is prohibited under the Chemical Weapons Convention, which both Russia and Ukraine have signed.
• The OPCW report confirms the use of CS gas but does not identify the source of the chemical agent.
• Previous accusations from the UK and US have alleged Russia's use of chemical agents in Ukraine, violating international law.