Articles on State Responsibility in International Law

The Articles on State Responsibility in International Law are the framework the International Law Commission adopted in 2001 to answer a single question: when has a country broken international law, and what does it owe as a result. The UN General Assembly commended the text in Resolution 56/83. It is not a binding treaty, but international courts and tribunals treat it as the authoritative statement of customary law on state responsibility, covering what counts as a wrongful act, whose conduct binds the state, which defenses excuse it, and what remedies the injured party can demand.¹

What Counts as an Internationally Wrongful Act

Article 2 sets the two-part test. A state commits an internationally wrongful act when conduct is attributable to it under international law and that conduct breaches an international obligation the state is bound by.¹ Both pieces must be present at the same time. A private citizen acting alone with no link to government cannot trigger state responsibility, and a government act that violates no treaty or customary rule is not a breach even if unpopular.

Wrongful conduct includes failures to act. If a state is obligated to protect foreign diplomats and does nothing while a mob storms an embassy, the omission is a wrongful act just as surely as an assault by its own soldiers would be.¹ The internal classification of the conduct under domestic law does not change the analysis. What matters is the international standard and whether the state’s behavior met it.

Whose Conduct Binds the State

Articles 4 through 11 answer the attribution question. The broadest rule comes first: any organ of the state, whether legislative, executive, judicial, or otherwise, and whether a national ministry or a minor local office, acts on behalf of the state under international law.¹

Formal Organs and De Facto Organs

Domestic law is the starting point for identifying state organs, but not the last word. The ILC commentary states that a country cannot escape responsibility by denying organ status to an entity that “does in truth act as one of its organs.”² Function matters as much as the label.

Article 5 extends attribution to persons or entities that are not formal organs but have been empowered by domestic law to exercise governmental authority. If a private security company runs a state prison, its conduct in that role is legally the state’s.¹ Outsourcing a government function does not outsource the responsibility.

Officials Who Exceed Their Authority

Article 7 closes a gap governments sometimes try to exploit. If a state organ or authorized entity acts in an official capacity, the conduct is attributable to the state even when the individual exceeded instructions or defied direct orders.¹ A border guard who abuses detained travelers while on duty binds the state, regardless of whether superiors authorized the behavior. Only conduct entirely disconnected from the official role falls outside this rule.

Private Actors Under State Direction

Article 8 reaches private individuals or groups acting on a state’s instructions or under its direction and control. A government cannot arm and direct a militia to carry out attacks and then claim no involvement because the fighters were not part of its formal military.¹

How much control is enough is the harder question. In the 1986 Nicaragua v. United States case, the International Court of Justice held that even though the United States financed, trained, supplied, and equipped the Nicaraguan contras, that involvement was not enough. The Court required proof of “effective control” over the specific operations in which the violations occurred.¹ General support and overall dependency fell short. The ICJ reaffirmed this standard in the 2007 Bosnian Genocide case, rejecting the broader “overall control” test the ICTY had applied in Tadić.

Insurgents Who Become the Government, and Adopted Conduct

Under Article 10, when a rebel movement succeeds in becoming the new government, the state inherits responsibility for what that movement did during the conflict.¹ The movement and the new government are treated as continuous.

Article 11 covers a stranger scenario. Conduct with no original connection to the state can become the state’s responsibility if the government later acknowledges and adopts it as its own.¹ Publicly claiming credit for a group’s actions forecloses later disavowal.

When an International Obligation Is Breached

Article 12 defines a breach as any act by a state that does not conform to what an international obligation requires, regardless of the obligation’s origin or character.¹ The obligation may come from a treaty, from customary international law, or from a binding resolution of an international organization. What matters is the gap between required and actual behavior.

Article 13 prevents retroactive application. A state can only be held responsible if the obligation was binding on it at the time the act occurred.¹ New rules cannot condemn yesterday’s conduct.

Timing also shapes the breach itself. Under Article 14, a breach by a single instantaneous act is complete the moment the act occurs, even if its effects linger. The illegal seizure of a foreign vessel is a completed breach at the moment of seizure. Unlawful detention of a foreign diplomat, by contrast, is a continuing breach that persists for as long as the detention lasts. Article 15 adds composite breaches, in which a series of actions or omissions together amount to a wrongful act. A pattern of discriminatory judicial decisions might not breach an obligation when viewed individually but does so when the series is sufficient in aggregate. The breach is not complete until the final qualifying act, and it extends backward over the entire series, though no action predating the obligation counts.¹ These categories affect when the clock starts, how damages accumulate, and what remedies fit.

Defenses That Remove Wrongfulness

Even conduct that is attributable and breaches an obligation can be excused. Articles 20 through 27 recognize six circumstances precluding wrongfulness. Each carries strict conditions, and none permanently erases the underlying obligation. They excuse the conduct only as long as the circumstance persists.

Consent

Under Article 20, valid consent by the affected state removes wrongfulness for conduct that would otherwise violate an obligation owed to it.¹ Consent must come from an authority competent to give it, and the conduct must stay within what was agreed.

Self-Defense

Article 21 precludes wrongfulness for a lawful measure of self-defense taken in conformity with the UN Charter.¹ The word “lawful” carries weight. A disproportionate response that exceeds what the Charter permits does not benefit from this excuse.

Force Majeure

Article 23 covers an irresistible force or unforeseen event beyond the state’s control that makes compliance materially impossible.¹ The defense fails if the state caused the situation or had assumed the risk.

Distress

Article 24 applies when a state agent has no other reasonable way to save their own life or those in their care. A military pilot entering foreign airspace for an emergency landing during mechanical failure is the classic case.¹ The defense fails if the state caused the distress or if the act creates an equal or greater danger.

Necessity

Necessity under Article 25 is the hardest defense to establish. The state must show the act was the only way to safeguard an essential interest against a grave and imminent peril, and that it did not seriously impair an essential interest of the other state or of the international community.¹ If a less convenient but lawful alternative existed, the defense fails. A state that contributed to the crisis cannot invoke it. Even a successful necessity defense does not necessarily eliminate the obligation to compensate for damage caused during non-compliance.

Which States Can Bring a Claim

Not every country can invoke responsibility against every wrongdoer. Article 42 defines an “injured” state as one to which the breached obligation was owed individually, or one specially affected by a breach of an obligation owed to a group of states or the international community. A state is also injured when the breach radically changes the position of all other states owed the obligation with respect to future performance.¹

When several states are injured by the same wrongful act, each may invoke responsibility separately without needing to coordinate.¹

Before responsibility can be invoked internationally, the injured party generally must exhaust local remedies. This customary rule gives the responsible state a chance to correct the violation through its own legal system first. Recognized exceptions apply when local courts lack jurisdiction, when the process involves undue delay attributable to the responsible state, or when local remedies offer no reasonable possibility of effective redress.

What the Responsible State Must Do

Once responsibility is established, Article 30 imposes two immediate obligations: cease the wrongful conduct if it is still ongoing, and offer appropriate assurances and guarantees of non-repetition where circumstances require.¹ These exist alongside the duty to make full reparation.

Full Reparation

Article 31 requires the responsible state to make full reparation for any injury, material or moral, caused by the wrongful act. The goal is to wipe out the consequences of the illegal conduct and restore the situation that would have existed. Under Article 39, if the injured state’s own willful or negligent conduct contributed to the harm, that contribution is taken into account.¹

Restitution

Restitution is the preferred remedy. Article 35 requires the responsible state to re-establish the situation that existed before the wrongful act.¹ Releasing wrongfully detained individuals, returning seized property, and withdrawing from occupied territory all qualify. The obligation applies unless restitution is materially impossible or would impose a burden wholly disproportionate to the benefit the injured state would gain.

Compensation

Where restitution cannot fully repair the damage, compensation fills the gap. Article 36 requires compensation for any financially assessable damage, including lost profits to the extent they can be established.¹ Calculations track fair market value and documented losses rather than speculative figures.

Article 38 adds that interest is payable when necessary to ensure full reparation, running from the date the principal sum should have been paid until the obligation is fulfilled. No single international standard governs the rate or method, and tribunals have traditionally been reluctant to award compound interest, though recent practice has occasionally allowed it where full reparation demanded it.³ When an award already includes lost profits, adding interest on the same period risks double recovery.

Satisfaction

Satisfaction addresses injuries money cannot fix. Under Article 37 it can take the form of an acknowledgment of the breach, an expression of regret, or a formal apology.¹ It is reserved for moral harm and affronts to a nation’s dignity, such as mistreatment of a national flag or insults to a head of state. Satisfaction must be proportionate to the injury and cannot be humiliating to the responsible state.

Countermeasures When Compliance Fails

If the responsible state refuses to comply, the injured state need not simply accept the situation. Articles 49 through 54 allow countermeasures: temporary actions that would normally violate the injured state’s own obligations toward the wrongdoer, taken specifically to induce compliance. The aim is restoration, not punishment.¹

Procedural Requirements

Countermeasures are not a first move. Under Article 52, the injured state must first call on the responsible state to fulfill its obligations and then notify it of any decision to take countermeasures while offering to negotiate.¹ Urgent countermeasures needed to preserve the injured state’s rights can be taken immediately. Countermeasures must be suspended once the wrongful act has ceased and the dispute has been submitted to a court or tribunal with binding authority, unless the responsible state is not participating in good faith.

Proportionality and Prohibited Targets

Article 51 requires that countermeasures be commensurate with the injury suffered, considering the gravity of the wrongful act and the rights involved. The assessment is qualitative as well as quantitative: the importance of the violated rule and the seriousness of the breach both matter, not just financial losses.⁴

Article 50 draws hard lines. No countermeasure may involve the threat or use of force, violate fundamental human rights obligations, breach humanitarian law prohibitions on reprisals, or conflict with other peremptory norms. States taking countermeasures must respect the inviolability of diplomatic and consular agents and premises and remain bound by applicable dispute settlement procedures.⁵ Countermeasures must end the moment the responsible state complies.

Serious Breaches of Peremptory Norms

Certain rules sit above all others. Known as peremptory norms, or jus cogens, they cannot be overridden by treaty or custom. The International Law Commission’s 2022 draft conclusions identify a non-exhaustive list: the prohibitions on aggression, genocide, crimes against humanity, slavery, torture, and racial discrimination and apartheid, along with the basic rules of international humanitarian law and the right of self-determination.⁶

Articles 40 and 41 establish a heightened regime for serious breaches of these norms. A breach qualifies as “serious” when it involves a gross or systematic failure by the responsible state to fulfill the obligation.⁷ An isolated incident may still be wrongful, but the heightened consequences apply only when the violation reaches a scale or pattern reflecting deliberate or flagrant disregard.p>

When a serious breach occurs, the consequences extend beyond what any single injured state can demand. Every state in the international community has a duty to cooperate through lawful means to bring the violation to an end, often through collective diplomatic pressure or economic sanctions. Two further prohibitions apply. No state may recognize as lawful a situation created by a serious breach, and no state may render aid or assistance in maintaining it.¹ Where territory has been annexed through aggression, other governments should not formally accept the annexation or provide support that helps the aggressor consolidate its hold. That collective refusal to normalize the violation is one of the strongest tools the legal order has to keep the most extreme abuses from settling into permanent fact.

1
United Nations. Responsibility of States for Internationally Wrongful Acts
2
United Nations. Responsibility of States for Internationally Wrongful Acts – Article 4
3
United Nations. Responsibility of States for Internationally Wrongful Acts – Article 38
4
United Nations. Responsibility of States for Internationally Wrongful Acts – Article 51
5
United Nations. Responsibility of States for Internationally Wrongful Acts – Article 50
6
International Law Commission. Draft Conclusions on Peremptory Norms of General International Law (Jus Cogens)
7
United Nations. Peremptory Norms of General International Law (Jus Cogens) – Chapter V