Resolution 1540 requires states to "promote the universal adoption and full implementation, and, where necessary, strengthening of multilateral treaties to which they are parties, whose aim is to prevent the proliferation of nuclear, biological or chemical weapons" (Article 8a) and to "fulfil their commitment to multilateral cooperation, in particular within the framework of the International Atomic Energy Agency, the Organisation for the Prohibition of Chemical Weapons, and the Biological and Toxin Weapons Convention" (Article 8c).