VCLT can be regarded as codification of CIL. One basic requirement is that change of circumstances must have been a fundamental one. Iceland refers increasing exploitation of fisheries resources. Those changes can be related to the merits of the dispute but they do not affect the obligation to submit to the court jurisdiction. The changes in fishing techniques do not constitute a fundamental change of circumstances to lapse the compromissory clause establishing the Court’s jurisdiction
Moreover, a fundamental change of circumstances, in order to terminate a treaty, must transform the obligations to be performed. FCC does not operate automatically neither allow unilateral denunciation; it only confers a right to call for the termination. The compromissory clause is the procedural complement of FCC
An agreement under threat or use of force is void, however, the court cannot consider an accusation of this nature on the basis of a vague general unfortified by evidence to support. The history of the negotiations reveals that the instruments were freely negotiated.