"Firstly, hydrocyanic acid is a dangerous poison," explained Nikulin. "In the United States, it is still used in gas chambers, and the Nazis used it to kill prisoners in concentration camps. This is one of the most poisonous substances on Earth. Other substances — chloropicrin, chloroacetophenone, these are, in general, special means that are used by the police to disperse demonstrators. A person who receives a large dose could die. They are banned in the European Union."
"It is used in grenades that are dropped from drones," said Nikulin. "Yes, this is indeed a substance on the Organization for the Prohibition of Chemical Weapons' (OPCW) list. It's also quite dangerous, even lethal. It affects the kidneys and the respiratory system causing their failure. If, for example, the same chloropicrin or chloroacetophenone is considered a non-lethal weapon, — although, again, it can become lethal if a person ends up in a cloud of this chloroacetophenone — this [anthraquinone] is a lethal weapon. This is truly a chemical weapon."