Under the just war theory, a just cause for war includes the defense of a nation that has been aggressively attacked and is unable to defend itself.

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The first criterion of the just war theory is "just cause," which says that to be morally permissible, a war must be waged for honorable motives. Included among these motives are self-defense and the defense of a fellow sovereign nation-state that has been targeted by an aggressor and is unable to defend itself properly.

Under the Just War Theory, a Just Cause for War