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World Court Digest



I. Substantive International Law - First Part
1. THE FOUNDATIONS OF INTERNATIONAL LAW
1.1. Good Faith

¤ Gabcíkovo-Nagymaros Project
(Hungary / Slovakia)
Judgment of 25 September 1997
I.C.J. Reports 1997, p. 7

[p. 67] 110. Nor can the Court overlook that Czechoslovakia committed the internationally wrongful act of putting into operation Variant C as a result of Hungary's own prior wrongful conduct. As was stated by the Permanent Court of International Justice:

"It is, moreover, a principle generally accepted in the jurisprudence of international arbitration, as well as by municipal courts, that one Party cannot avail himself of the fact that the other has not fulfilled some obligation or has not had recourse to some means of redress, if the former Party has, by some illegal act, prevented the latter from fulfilling the obligation in question, or from having recourse to the tribunal which would have been open, to him." (Factory at Chorzow, Jurisdiction, Judgment No. 8, 1927, P.C.I.J., Series A, No. 9, p. 31.)

Hungary, by its own conduct, had prejudiced its right to terminate the Treaty; this would still have been the case even if Czechoslovakia, by the time of the purported termination, had violated a provision essential to the accomplishment of the object or purpose of the Treaty.

[pp. 78-79] 141. It is not for the Court to determine what shall be the final result of these negotiations to be conducted by the Parties. It is for the Parties themselves to find an agreed solution that takes account of the objectives of the Treaty, which must be pursued in a joint and integrated way, as well as the norm of international environmental law and the principles of the law of international watercourses. The Court will recall in this context that, as it said in the North Sea Continental Shelf cases:

"[the Parties] are under an obligation so to conduct themselves that the negotiations are meaningful, which will not be the case when either of them insists upon its own position without contemplating any modification of it" (I.C.J. Reports 1969, p. 47, para. 85).

142. What is required in the present case by the rule pacta sunt servanda, as reflected in Article 26 of the Vienna Convention of l969 on the Law of Treaties, is that the Parties find an agreed solution within the co-operative context of the Treaty.

Article 26 combines two elements, which are of equal importance. It provides that "Every treaty in force is binding upon the parties to it and must be performed by them in good faith". This latter element, in the Court's view, implies that, in this case, it is the purpose of the Treaty, and the intentions of the parties in concluding it, which should prevail over its literal application. The principle of good faith obliges the Parties to apply it in a reasonable way and in such a manner that its purpose can be realized.

143. During this dispute both Parties have called upon the assistance of the Commission of the European Communities. Because of the diametrically opposed positions the Parties took with regard to the required outcome of the trilateral talks which were envisaged, those talks did not succeed. When, after the present Judgment is given, bilateral negotiations without pre-conditions are held, both Parties can profit from the assistance and expertise of a third party. The readiness of the Parties to accept such assistance would be evidence of the good faith with which they conduct bilateral negotiations in order to give effect to the Judgment of the Court.