Cessation

Cessation in public international law denotes the duty of a State that has committed a continuing internationally wrongful act to stop the wrongful conduct. It is codified in Article 30(a) of the International Law Commission's Articles on Responsibility of States for Internationally Wrongful Acts (ARSIWA, 2001), which provides that the responsible State is under an obligation "to cease that act, if it is continuing." Alongside cessation, Article 30(b) couples the duty to offer "appropriate assurances and guarantees of non-repetition, if circumstances so require." Cessation is conceptually separate from reparation (Article 31) — it looks to the future and the restoration of legality, whereas reparation looks to the past and wipes out the consequences of the breach. The ILC drew on the Rainbow Warrior arbitration (New Zealand v. France, 1990), which distinguished cessation from reparation, and on the LaGrand case (Germany v. United States, ICJ 2001), where the Court treated assurances of non-repetition as a distinct legal remedy.

The defining feature of cessation is that it presupposes a continuing wrongful act and the continued existence of the primary obligation breached. Where the underlying obligation has lapsed or the conduct is already complete, cessation has no object — only reparation remains. Cessation is not contingent on the injured State's demand; it flows automatically from the persistence of the breach and the principle that the rule of law must be re-established. The ILC commentary stresses that cessation serves the protection of both the injured State's interest and the general interest of the international community in the integrity of the violated norm, which is especially salient where obligations erga omnes or peremptory norms (jus cogens) are at stake. Assurances and guarantees of non-repetition, by contrast, are more flexible and are required only where there is a real risk of repetition warranting them.

Named instances illustrate the doctrine. In the Tehran Hostages case (United States v. Iran, ICJ 1980) the Court ordered Iran to immediately terminate the unlawful detention of diplomatic and consular staff — a paradigmatic cessation order. In the Wall Advisory Opinion (ICJ 2004) the Court held Israel obliged to cease construction of the barrier in the Occupied Palestinian Territory and to dismantle completed sections, blending cessation with restitution. In LaGrand (2001) the ICJ accepted the United States' commitment to implement specific measures as adequate assurances of non-repetition under the consular-notification obligation of the Vienna Convention on Consular Relations, Article 36. As of 2026 ARSIWA remains a non-binding ILC text, yet Articles 30 and 31 are widely accepted as reflecting customary international law and are routinely invoked before the ICJ and arbitral tribunals.

For the exam, cessation appears squarely in the State Responsibility segment of the International Law paper (UPSC optional/Law, FSOT, CSS International Law). The typical question angle asks candidates to distinguish cessation from reparation and from restitution, to locate the rule in Article 30 ARSIWA, and to illustrate it with the Tehran Hostages, Rainbow Warrior, LaGrand and Wall opinions. A strong answer emphasises that cessation is forward-looking, attaches only to continuing breaches of subsisting obligations, and is logically prior to the secondary obligation of reparation.