Bashar Al Assad has gassed his own people. An assassin used VX to murder Kim Jong Un’s half-brother. Now, Russia has allegedly used an obscure Cold War era chemical weapon to assassinate an old spy on British soil. The taboo against chemical weapons has eroded and, for those willing to use them, they’re an effective weapon of war.

This week on War College, The Daily Beast reporter Adam Rawnsley walks us through the lastest on the chemical weapon attacks in Britain and what these eroding norms might mean for the future.

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