Law-ref.org Conference on Security and Co-operation in Europe - Final Act - Helsinki 1975
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IV. Territorial integrity of States

The participating States will respect the territorial integrity of each of the participating States.
Accordingly, they will refrain from any action inconsistent with the purposes and principles of the Charter of the United Nations against the territorial integrity, political independence or the unity of any participating State, and in particular from any such action constituting a threat or use of force.
The participating States will likewise refrain from making each other's territory the object of military occupation or other direct or indirect measures of force in contravention of international law, or the object of acquisition by means of such measures or the threat of them. No such occupation or acquisition will be recognized as legal.