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Kyiv, he claimed, was violating the international Chemical Weapons Convention with a variety of substances with the assistance of Western countries, including the psychochemical warfare agent BZ as well as hydrocyanic acid and cyanogen chloride.

The “Chemical Plant Area” was used from 1949 through the 1960s for the renovation and destruction of weapons including mustard agent, cyanogen chloride and phosgene bombs ranging from 100 to 1,000 pounds.

The tests also included VX nerve agent, phosgene, cyanogen chloride and hydrogen cyanide - the same gas formerly used in executions.

They also form a toxic gas called cyanogen chloride, which can damage the heart, lungs and nervous system.

It exists in two states: as the colorless gases hydrogen cyanide and cyanogen chloride or in crystal form as sodium cyanide or potassium cyanide.