Every State has the duty to refrain in its international relations from the threat or use of force against the territorial integrity or political independence of any State, or in any other manner inconsistent with the purposes of the United Nations. Such a threat or use of force constitutes a violation of international law and the Charter of the United Nations and shall never be employed as a means of settling international issues.
A war of aggression constitutes a crime against the peace, for which there is responsibility under international law.
In accordance with the purposes and principles of the United Nations, States have the duty to refrain from propaganda for wars of aggression.
Every State has the duty to refrain from the threat or use of force to violate the existing international boundaries of another State or as a means of solving international disputes, including territorial disputes and problems concerning frontiers of States.
Every State likewise has the duty to refrain from the threat or use of force to violate international lines of demarcation, such as armistice lines, established by or pursuant to an international agreement to which it is a party or which it is otherwise bound to respect. Nothing in the foregoing shall be construed as prejudicing the positions of the parties concerned with regard to the status and effects of such lines under their special regimes or as affecting their temporary character.
States have a duty to refrain from acts of reprisal involving the use of force.
Every State has the duty to refrain from any forcible action which deprives peoples referred to in the elaboration of the principle of equal rights and self-determination of their right to self-determination and freedom and independence.
Every State has the duty to refrain from organizing or encouraging the organization of irregular forces or armed bands including mercenaries, for incursion into the territory of another State.
Every State has the duty to refrain from organizing, instigating, assisting or participating in acts of civil strife or terrorist acts in another State or acquiescing in organized activities within its territory directed towards the commission of such acts, when the acts referred to in the present paragraph involve a threat or use of force.
SOURCE: DECLARATION ON PRINCIPLES OF INTERNATIONAL LAW FRIENDLY RELATIONS AND CO