The article analyses the past century of the law of weaponry and identifies aspects commonly regulated by most treaties and the use of weapons in armed conflicts. It identifies tendencies that emerged during the 20th century with regard to the regulation of weapons in detail and with regard to international (humanitarian) law in general that will remain relevant during the 21st century. In the end, the major tendency of "non-internationalization" of weapons law is recognized, covering the applicability of specific treaties in non-international armed conflicts as well as the involvement of non-state actors. It is submitted that these tendencies will continue during the 21st century : states will continue to opt for an ad hoc approach to outlaw the development, production, stockpiling and use of specific weapons while following the overall tendency to include non-international armed conflicts in the scope of these treaties and perhaps even to impose duties directly on non-state actors.
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