In 1995, Japan’s Aum Shinrikyo cult turned the nerve agent on a small number of its members, whom leaders believed to be police informants. On a larger scale, VX was one of the chemical weapons deployed in the Iran-Iraq war. The Kim Jong Nam case, though, would be the first VX assassination on record, and the first time chemical weapons were used to that end since a ricin pellet—fired from an umbrella gun—took Bulgarian dissident Georgi Markov’s life in 1978.

Read Here – Wired