As to who mandates, I do not think I can do any better in answering that question succinctly than to quote the Secretary-General of the United Nations who has appealed to the international community to restore the UN Security Council to what he has called its "pre-eminent position as the sole source of legitimacy on the use of force."
Thanks to the efforts of the general they wish to bring back the security council as that is thought to be best by him