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Existing arms control treaties are under threat - at the same time that new types of weapon emerge, with nothing to regulate them. There is a growing crisis in the arms control regimes inherited from the Cold War era, which threatens to undermine existing agreements. At the same time, new technologies are emerging like drones, cyberwar, biotech and hypersonic weapons, which are not covered by existing rules. BBC Defence and Diplomatic Correspondent Jonathan Marcus asks if a new era of chaos beckon or might the whole idea of arms control and disarmament be revived?\\nProducer: Matthew Woodcraft.