"Belligerency" is a term used in international law to indicate the status of two or more entities, generally sovereign states, being engaged in a war. Wars are often fought with one or both parties to a conflict invoking the right to self-defence under Article 51 of the United Nations Charter[4] (as the United Kingdom did in 1982 before the start of the Falklands War[5]) or under the auspices of a United Nations Security Council resolution (such as the United Nations Security Council Resolution 678, which gave legal authority for the Gulf War).