- Collective security — Customary international law — UN Charter — Crimes against humanity — Genocide — War crimes
This chapter examines the division of competence between the UN Security Council and the UN General Assembly concerning matters of international peace and security but placed within the context of the prohibition on the use of force. Although the Security Council can authorize the use of force by states, what is not clear is whether the General Assembly can recommend that states take military action. The chapter considers the conundrum faced by the United Nations with respect to an imminent and catastrophic use of force or act of egregious violence, when the UN Security Council is deadlocked because of the lack of agreement between the permanent members. It discusses the debate over the legality of the (in)famous Uniting for Peace Resolution of 1950 within the context of the emerging principle of a Responsibility to Protect (R2P) as well as within existing principles of international law.
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