clausula rebus sic stantibus

In public international law, clausula rebus sic stantibus (Latin for "things thus standing") is the legal doctrine allowing for treaties to become inapplicable because of a fundamental change of circumstances. It is essentially an "escape clause" that makes an exception to the general rule of pacta sunt servanda (promises must be kept).

Because the doctrine poses a risk to the security of treaties as its scope is relatively unconfined, it requires strict regulations as to the conditions in which it may be invoked.

The doctrine is part of customary international law, but is also provided for in the 1969 Vienna Convention on the Law of Treaties under Article 62 (Fundamental Change of Circumstance), although the doctrine is never mentioned by name. Article 62 provides the only two justifications of the invocation of rebus sic stantibus: first, that the circumstances existing at the time of the conclusion of the treaty were indeed objectively essential to the obligations of treaty (sub-paragraph A) and the instance wherein the change of circumstances has had a radical effect on the obligations of the treaty (sub-paragraph B).

If the parties to a treaty had contemplated for the occurrence of the changed circumstance the doctrine does not apply and the provision remains in effect. Clausula rebus sic stantibus only relates to changed circumstances that were never contemplated by the parties. This principle is clarified in the Fisheries Jurisdiction Case (United Kingdom v. Iceland, 1973).

Although it is clear that a fundamental change of circumstances might justify terminating or modifying a treaty, unilateral denunciation of a treaty is prohibited; a party does not have the right to denounce a treaty unilaterally.

The doctrine of rebus sic stantibus does not operate automatically to render the treaty inoperative. There is a necessity for a formal act of rejection, usually made by the head of State, with a statement of the reasons why compliance with the treaty is no longer required.

In lieu thereof, the treaty may be denounced even without an expressed justification for this action. Such denunciation is authorized under its Article 39, viz:

Article 39. (1) Any one of the High Contracting Parties may denounce this convention by a notification addressed to the Government of the Republic of Poland, which shall at once inform the Government of each of the High Contracting Parties.

(2) Denunciation shall take effect six months after the notification of denunciation, and shall operate only as regards the party which shall have proceeded to denunciation.

Obviously. rejection of the treaty, whether on the ground of rebus sic stantibus or pursuant to Article 39, is not a function of the courts but of the other branches of government. This is a political act. The conclusion and renunciation of treaties is the prerogative of the political departments and may not be usurped by the judiciary. The courts are concerned only with the interpretation and application of laws and treaties in force and not with their wisdom or efficacy.

G.R. No. 101538 June 23, 1992
AUGUSTO BENEDICTO SANTOS III, represented by his father and legal guardian, Augusto Benedicto Santos, petitioner,
vs.
NORTHWEST ORIENT AIRLINES and COURT OF APPEALS, respondents.