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(1) military necessity (which permits the use of only that degree and kind of force, not otherwise prohibited by the law of armed conflict, that is required to achieve the legitimate military purpose of the conflict); (2) distinction (which requires discrimination between the armed forces and military targets and, on the other hand, non-combatants, civilians, and civilian targets); (3) proportionality (which requires that losses resulting from a military action should not be excessive in relation to the military advantage expected to be gained from the action); and, above all, (4) humanity (which forbids the infliction of suffering, injury, or destruction not necessary for the accomplishment of legitimate military purposes). The implications of these principles, and of more detailed prohibitions on weapons and tactics, are spelled out in military manuals issued by many States, such as The Manual of the Law of Armed Conflict issued by the UK Ministry of Defence in 2004. Serious violations of the laws of war, such as the deliberate targeting of civilian non-combatants or the wanton destruction of towns and villages, amount to war crimes, for which the perpetrators may be punished by national courts, or by an international criminal tribunal that has jurisdiction over the events in question. Such international tribunals have been established on an ad hoc basis following the conflicts in the former Yugoslavia and in Rwanda, and (in slightly different hybrid forms, as ‘internationalized criminal courts’—national courts with some international judges) for Cambodia, East Timor, Kosovo, and Sierra Leone. There is also the permanent International Criminal Court (‘ICC’) established in 2002 under the 1998 treaty known as the Rome Statute. By the end of 2013 the ICC had exercised its jurisdiction in relation to seven conflicts, all of them in Africa, and was investigating alleged war crimes and crimes against humanity in other situations.
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Vaughan Lowe (International Law: A Very Short Introduction (Very Short Introductions))