"UN Security Council Resolution 1540 and the Chemical Weapons Convention: Challenges, Complementarities and Syneriges""This article examines the collaborative potential of UN Security Council resolution 1540 (2004) and the Chemical Weapons Convention (CWC). It delves into implementation ob- stacles and the interplay between the two instruments, advocating for their inherent synergy to strengthen the international non-proliferation legal framework. Highlighting the complementarity between the CWC and resolution 1540, particularly in preventing non- State actors’ access to chemical weapons and enhancing verification measures, this paper underscores the potential of collaboration for a more comprehensive chemical, biological, and nuclear non-proliferation approach, relying on international cooperation."