It is important to remember that chemical warfare is prohibited under international law, in the terms of the Chemical Weapons Convention (CWC) – a treaty established in 1997 and to which both Moscow and Kiev are signatories. The document forbids the use of all types of weapons equipped with toxic chemical compounds, including non-lethal ones. However, constant violations of international norms have already become commonplace among Ukrainian forces, which is why the use of these weapons would not be surprising.

Ukrainian military accused of using chemical weapons against Russians – Counter Information