Law-ref.org Conference on Security and Co-operation in Europe - Final Act - Helsinki 1975
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II. Refraining from the threat or use of force

The participating States will refrain in their mutual relations, as well as in their international relations in general, 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 and with the present Declaration. No consideration may be invoked to serve to warrant resort to the threat or use of force in contravention of this principle.
Accordingly, the participating States will refrain from any acts constituting a threat of force or direct or indirect use of force against another participating State. Likewise they will refrain from any manifestation of force for the purpose of inducing another participating State to renounce the full exercise of its sovereign rights. Likewise they will also refrain in their mutual relations from any act of reprisal by force.
No such threat or use of force will be employed as a means of settling disputes, or questions likely to give rise to disputes, between them.