Law-ref.org Conference on Security and Co-operation in Europe - Final Act - Helsinki 1975
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X. Fulfilment in good faith of obligations under international law

The participating States will fulfil in good faith their obligations under international law, both those obligations arising from the generally recognized principles and rules of international law and those obligations arising from treaties or other agreements, in conformity with international law, to which they are parties.
In exercising their sovereign rights, including the right to determine their laws and regulations, they will conform with their legal obligations under international law; they will furthermore pay due regard to and implement the provisions in the Final Act of the Conference on Security and Co-operation in Europe.
The participating States confirm that in the event of a conflict between the obligations of the members of the United Nations under the Charter of the United Nations and their obligations under any treaty or other international agreement, their obligations under the Charter will prevail, in accordance with Article 103 of the Charter of the United Nations.
All the principles set forth above are of primary significance and, accordingly, they will be equally and unreservedly applied, each of them being interpreted taking into account the others.
The participating States express their determination fully to respect and apply these principles, as set forth in the present Declaration, in all aspects, to their mutual relations and co-operation in order to ensure to each participating State the benefits resulting from the respect and application of these principles by all.
The participating States, paying due regard to the principles above and, in particular, to the first sentence of the tenth principle, "Fulfilment in good faith of obligations under international law", note that the present Declaration does not affect their rights and obligations, nor the corresponding treaties and other agreements and arrangements.
The participating States express the conviction that respect for these principles will encourage the development of normal and friendly relations and the progress of co-operation among them in all fields. They also express the conviction that respect for these principles will encourage the development of political contacts among them which in time would contribute to better mutual understanding of their positions and views.
The participating States declare their intention to conduct their relations with all other States in the spirit of the principles contained in the present Declaration.