Rochelle Ferguson Bouyahi is pleased to welcome Fanny Badache, Researcher at Sciences Po and Lecturer at the University of Geneva. The UN mandate is international peace and security, yet its ability to fulfill that mandate ultimately depends on the cooperation of sovereign states, namely the five powerful permanent members of the Security Council. As the UN is confronted with an increasingly fragmented, volatile and unpredictable international order, Badache argues that when those powers are divided, the mechanisms designed to enable collective security can instead produce paralysis.