Editor's note

Malaysian authorities have said the death of Kim Jong-nam in February 13 at Kuala Lumpur airport was caused by banned chemical weapon know as VX nerve agent.

We asked a toxicologist to explain what the agent is and how it works, and an expert on international law to examine the implications of using a banned toxin to kill someone on foreign soil. Here's what you need to know.

Reema Rattan

Global Commissioning Editor

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Members of the youth wing of the National Front, Malaysia’s ruling coalition, hold placards during a protest at the North Korea embassy following the murder of Kim Jong-nam in Kuala Lumpur. Athit Perawongmetha/Reuters

Malaysia says Kim Jong-nam was killed with a chemical weapon – here's what you need to know

Emily Crawford, University of Sydney; Ian Musgrave, University of Adelaide

Using nerve agents is banned under the Chemical Weapons Convention, but North Korea is not a party to it.

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