Just war is the notion that the use of armed force is justified under certain conditions (jus ad bellum) and that such force should be limited in certain ways (jus in bello). Among the proposed conditions for the just resort to war are that the cause be just (e.g., self-defense against an attack or the threat of imminent attack), that the authority undertaking the war be competent, that all peaceful alternatives be exhausted, and that there be a reasonable hope of success.
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