Ukraine-Russia, questions and answers on chemical weapons. Which ones do the Russians use?

LONDON. What chemical weapons could Russia use in the war in Ukraine? And how? The Azov battalion and the newspaper Kyiv Independent sound the alarm: “A drone released a toxic substance at the gates of Mariupol, intoxicating at least three people.” So far there is no evidence or confirmation: concern of all the Western chancelleries, but the president himself, Volodymyr Zelensky, has declared that he has no evidence, at least at the moment. At the