Can U.S. Sanctions on Iran Be an “Act of War” Under International Law?
- Edmarverson A. Santos
- 16 hours ago
- 19 min read
Introduction
On 23 August 2026, the secretary of Iran’s Supreme National Security Council warned that countries participating in or supporting the expanding U.S. economic campaign against Iran could be treated as committing an “act of war” (Reuters, 2026). The Iran sanctions “act of war” claim raises a narrower legal question than the political language suggests: can non-forcible economic sanctions amount to a use of force or an armed attack under international law, and could they provide Iran with a legal basis for military action?
“Act of war” is not the controlling legal category under the United Nations Charter. Article 2(4) prohibits the threat or use of force in international relations, while Article 51 preserves the inherent right of self-defense if an armed attack occurs (United Nations, 1945). An economic measure may be coercive, economically damaging, or internationally wrongful without amounting to either a use of force or an armed attack.
The question arises against the unusual background of an existing international armed conflict between the United States and Iran in 2026. U.S. military operations and the naval blockade directed at Iranian shipping must be kept legally distinct from asset freezes, banking restrictions, trade prohibitions, and secondary sanctions (Reuters, 2026). The fact that armed hostilities already exist does not convert every economic measure adopted during the conflict into an armed attack.
The prevailing interpretation of the Charter does not generally classify non-forcible economic sanctions as armed force, and established international law provides no clear basis for treating ordinary sanctions, standing alone, as an armed attack capable of triggering Article 51. The International Court of Justice has consistently distinguished among prohibited intervention, use of force, and armed attack rather than treating all forms of coercion as legally equivalent (ICJ, 1986). That distinction leaves open a separate question: particular sanctions may still violate other international obligations.
Those possible violations belong to different areas of law. Sanctions may raise issues under the customary prohibition of intervention, rules governing jurisdiction, treaty obligations, or the law of State responsibility. Secondary sanctions can create additional disputes where foreign banks, companies, or governments are pressured to restrict otherwise lawful dealings with Iran. None of those forms of possible wrongfulness automatically establishes an armed attack.
The warning to third countries presents the most difficult extension of the claim. A State that independently adopts restrictions against Iran, a government that assists another State in enforcing unlawful measures, and a private company that withdraws from Iranian commerce for commercial reasons do not occupy the same legal position. International responsibility, participation in an armed conflict, and a possible Iranian right to use force in self-defense must each be assessed under separate legal rules.
1. U.S. Sanctions on Iran and the “Act of War” Claim
The August 2026 warning that participation in the U.S. economic campaign could be treated as an “act of war” uses language with considerable political weight, but the phrase does not establish an autonomous legal category under the United Nations Charter. Contemporary international law asks more specific questions: has a State threatened or used force, has an armed attack occurred, has an act of aggression been committed, or has conduct brought international humanitarian law into operation? A government’s description of economic pressure as warfare cannot answer those questions by itself.
That position reflects the movement away from the older legal importance attached to formally declared war. Common Article 2 of the 1949 Geneva Conventions applies not only to declared war but also to any other armed conflict arising between High Contracting Parties, even where one party does not recognize the existence of a state of war. Contemporary IHL accordingly bases the existence of an international armed conflict on the objective resort to armed force between States rather than the terminology chosen by their governments (Geneva Conventions, 1949, common art. 2; ICRC, 2025).
The August warning is significant because it suggests consequences for States whose involvement may be economic rather than military. Its legal validity cannot rest on the expression “act of war.” The relevant questions are whether the economic measures themselves fall within the Charter rules on force and self-defense, and whether a third State’s involvement could independently satisfy those rules.
1.1 Use of force, armed attack, and aggression
Article 2(4) of the UN Charter requires Member States to refrain from the threat or use of force against the territorial integrity or political independence of another State, or in any other manner inconsistent with the purposes of the United Nations. Article 51 addresses the right of individual or collective self-defense “if an armed attack occurs” (United Nations, 1945). In the jurisprudence of the International Court of Justice, these concepts are not interchangeable. The Court has distinguished the most grave forms of the use of force, which constitute armed attacks, from less grave forcible conduct (ICJ, 1986, para. 191).
That distinction is influential but not wholly uncontested in State practice. The United States, for example, has rejected the proposition that international law imposes a separate minimum-gravity threshold before an unlawful use of force can potentially trigger self-defense (U.S. Department of State, 2012). The disagreement concerns the relationship between unlawful force and armed attack; it does not amount to a U.S. position that ordinary economic sanctions themselves constitute armed force.
Aggression is a related but separate concept. General Assembly Resolution 3314 defines aggression in terms of the use of armed force by one State against another and identifies invasion, bombardment, attacks by armed forces, and blockade among the listed examples (UN General Assembly, 1974). Resolution 3314 is a non-binding General Assembly instrument intended to assist in identifying acts of aggression, although the ICJ has recognized parts of it, including Article 3(g), as reflecting customary international law (ICJ, 1986, para. 195). The list is not exhaustive, but Resolution 3314 does not provide a basis for treating an ordinary economic sanction, without an armed component, as aggression. The individual crime of aggression under Article 8 bis of the Rome Statute raises a distinct question of criminal responsibility and does not determine whether sanctions trigger Article 51.
International humanitarian law serves another function. The existence of an international armed conflict depends on interstate armed force, not on a formal declaration of war or on the legality of the initial resort to force. Current hostilities between the United States and Iran in 2026 satisfy that factual setting, while their legal classification follows from Common Article 2 rather than political descriptions of the relationship (Reuters, 2026a; Geneva Conventions, 1949, common art. 2; ICRC, 2025). The sanctions are consequently not the event that creates the existing armed conflict. The question here is whether they provide a separate legal basis for the use of force, particularly against States involved only in economic measures.
2. Can Economic Sanctions Be a Use of Force?
The prevailing interpretation of Article 2(4) does not treat ordinary economic pressure as a use of force. The Charter provision itself refers simply to “force,” rather than expressly to “armed force,” and efforts to give the term a broader economic meaning have a long history. At the San Francisco Conference, Brazil proposed language that would have extended the prohibition to the threat or use of economic measures in a manner inconsistent with the purposes of the United Nations. That proposal was not adopted (UNCIO, 1945).
The rejection of the Brazilian proposal is relevant, but its interpretive significance should not be exaggerated. Some commentators have treated the drafting history as support for confining Article 2(4) to armed force, while others have argued that the failure of an amendment does not conclusively define the scope of the provision. Later disputes over economic coercion confirm that States have not always agreed on how far Charter protections should reach (Batinga, 2024). The prevailing legal position nonetheless continues to distinguish economic coercion from armed force.
The structure of Chapter VII reinforces that distinction. Article 41 authorizes the Security Council to take measures “not involving the use of armed force” and expressly includes complete or partial interruption of economic relations. Article 42 separately authorizes action by air, sea, or land forces when Article 41 measures would be inadequate (United Nations, 1945). Within the Charter’s own architecture, interruption of economic relations and armed enforcement are treated as different forms of action.
Article 41 does not establish that unilateral U.S. sanctions are lawful. Security Council measures adopted under Chapter VII derive their authority from the Charter, whereas restrictions imposed by a single State must be assessed against whatever international obligations bind that State. Article 41 is relevant here for a narrower reason: it provides strong contextual evidence that economic restrictions are not ordinarily classified as armed force merely because they are coercive.
International law has nonetheless developed substantial objections to economic pressure outside Article 2(4). Under the non-intervention principle contained in the Friendly Relations Declaration, no State may use economic, political, or other measures to coerce another State in order to obtain the subordination of its sovereign rights or advantages of any kind (UN General Assembly, 1970). The significance of such language lies in the law of intervention and economic coercion, not in a reclassification of economic pressure as armed force.
More recent scholarship has tested the orthodox distinction by focusing on consequences rather than instruments. Severe restrictions on finance, trade, technology, energy, or access to essential goods can cause profound economic and humanitarian effects. An effects-based approach, influenced partly by debates concerning cyber operations and other forms of non-kinetic coercion, asks whether exceptionally destructive economic conduct should remain categorically outside Article 2(4) (Batinga, 2024). Such arguments expose genuine difficulties in the existing framework, but they have not yet generated sufficiently consistent State practice and opinio juris to establish economic sanctions, as such, as a use of force under current international law.
The present U.S.-Iran conflict also requires a strict distinction between economic sanctions and military action. U.S. financial restrictions operate alongside a naval blockade and other military measures reported as continuing in August 2026 (Reuters, 2026b). An armed blockade, forcible interdiction, seizure enforced by military power, or kinetic strike raises legal questions that an asset freeze, banking prohibition, or trade restriction does not. Resolution 3314 includes the blockade of a State’s ports or coasts by another State’s armed forces among the acts capable of constituting aggression (UN General Assembly, 1974, art. 3(c)), but the legality and classification of any particular contemporary blockade depend on the surrounding facts and any legal justification advanced for it. A conclusion about non-forcible sanctions cannot decide those separate questions.
3. Can Sanctions Amount to an Armed Attack?
The right of self-defense presents an even more demanding question. In the ICJ’s jurisprudence, Article 51 is not triggered by every form of coercion or even by every unlawful use of force. In Military and Paramilitary Activities in and against Nicaragua, the Court distinguished the “most grave forms” of force constituting armed attacks from less grave uses of force. It also held that the sending of armed bands could qualify as an armed attack where the scale and effects of their acts would have produced the same classification had regular armed forces carried them out (ICJ, 1986, paras. 191, 195).
The Court drew further distinctions concerning assistance to armed groups. The provision of weapons or logistical support to rebels did not, without more, constitute an armed attack by the assisting State, although such support could implicate the prohibitions on intervention or the use of force (ICJ, 1986, para. 195). This reasoning concerns armed and military assistance. It does not create a general formula under which any harmful measure can be converted into an armed attack merely by comparing its consequences with those of military violence.
Nicaragua also dealt separately with economic measures adopted by the United States. Nicaragua complained of the termination of economic assistance, a substantial reduction in its sugar quota, and a trade embargo. The Court concluded that it was unable, on the circumstances before it, to regard the economic actions complained of as a breach of the customary principle of non-intervention (ICJ, 1986, para. 245). That passage does not establish that economic coercion can never violate non-intervention, nor did the Court use it to decide whether economic sanctions could constitute an armed attack. Nicaragua consequently provides no authority for treating those measures as an Article 51 attack.
Later decisions confirm the ICJ’s careful approach to claims of self-defense. In Oil Platforms, the United States had to establish that incidents attributable to Iran amounted to armed attacks and that its response satisfied the requirements of necessity and proportionality. The Court found deficiencies in the evidence attributing important incidents to Iran and concluded that the relevant attacks, considered individually or cumulatively, did not establish the armed attack necessary to sustain the U.S. defense (ICJ, 2003, paras. 51, 64, 72). The dispute involved mines, attacks on vessels, and military operations, not economic sanctions.
In Armed Activities on the Territory of the Congo, Uganda relied on attacks by the Allied Democratic Forces as part of its justification for military action in the Democratic Republic of the Congo. The Court found insufficient evidence that the attacks were attributable to the DRC and held that the legal and factual circumstances required for Uganda’s exercise of self-defense against the DRC were absent. It expressly left unresolved broader questions concerning self-defense against large-scale attacks by irregular forces (ICJ, 2005, paras. 146–147). The judgment reinforces the importance of identifying the legally relevant attack and responsibility for it before Article 51 can be invoked.
The ICJ’s gravity distinction is not universally accepted. The United States has maintained that self-defense may potentially be available against any unlawful use of force and has rejected a rigid additional gravity requirement (U.S. Department of State, 2012). Even on that broader position, however, the starting point remains a use of force. It does not supply an argument that non-forcible banking restrictions, asset freezes, or trade sanctions become armed attacks because their economic consequences are severe.
A harder theoretical question arises where economic restrictions inflict catastrophic effects. Comprehensive sanctions can impair access to finance, trade, technology, medicines, food, or other essential goods, and legal scholarship has questioned whether an exclusively instrument-based conception of armed force adequately addresses such harm. Effects-based theories offer one possible route toward a different rule, but present international law has not accepted the proposition that economic sanctions without an armed component constitute an armed attack solely because of their severity.
That conclusion is narrower than a judgment that the sanctions are lawful. A particular measure may breach a treaty obligation, violate the prohibition of intervention, exceed permissible jurisdiction, infringe another international obligation, or fail to meet the conditions governing countermeasures. Those forms of wrongfulness can produce State responsibility and may permit non-forcible legal responses. They do not, without a qualifying armed attack, create an independent right to answer economic pressure with military force. For the Iran sanctions “act of war” claim, the distinction between an internationally wrongful economic measure and an armed attack remains central.
4. If Sanctions Are Unlawful, Which Rule Is Breached?
International law contains no single rule under which all unilateral sanctions are lawful or unlawful. Much depends on the measure itself: whether it breaches an obligation owed to the target State, rests on a permissible jurisdictional basis, interferes coercively with matters reserved to sovereign choice, or constitutes conduct that would otherwise be unlawful but is justified as a countermeasure.
Iran’s litigation against the United States illustrates the importance of identifying the particular obligation involved. The 1955 Treaty of Amity once supplied a treaty basis for several Iranian claims. The United States gave notice of termination on 3 October 2018, and Article XXIII(3) provided that termination would take effect one year later. The Treaty consequently ceased to bind the parties prospectively on 3 October 2019.
That did not extinguish disputes concerning earlier conduct. In 2018, the ICJ indicated binding provisional measures requiring the United States to remove impediments affecting medicines, food and agricultural products, and goods necessary for civil-aviation safety (ICJ, 2018). In 2021, the Court rejected U.S. preliminary objections in Iran’s challenge to sanctions reimposed in 2018, including objections concerning measures affecting trade with third countries, but it did not decide the merits of those sanctions (ICJ, 2021). No merits judgment is presently listed in that case.
The 2023 judgment in Certain Iranian Assets concerned a different dispute. The Court found violations of Articles III(1), IV(1), IV(2), and X(1) of the Treaty in relation to certain Iranian companies and their property, while finding that it lacked jurisdiction over Iran’s claims concerning Bank Markazi under several Treaty provisions (ICJ, 2023). The decision does not establish a general rule that sanctions against Iran are unlawful; it demonstrates instead that measures associated with economic pressure may breach specific obligations where those obligations apply.
4.1 Non-intervention and economic coercion
The customary prohibition of intervention offers a stronger doctrinal route for challenging coercive economic measures than the claim that sanctions are armed force. In Nicaragua, the ICJ held that States are entitled to decide freely matters such as their political, economic, social, and cultural systems and the formulation of foreign policy. Intervention becomes unlawful when coercive methods are directed at those protected choices (ICJ, 1986, para. 205).
Economic pressure does not automatically satisfy that test. The Court separately considered the termination of U.S. economic aid, the reduction of Nicaragua’s sugar quota, and the trade embargo, concluding that it was unable on the facts before it to regard those measures as breaches of the customary non-intervention principle (ICJ, 1986, para. 245). That was a fact-specific finding, not a ruling that economic coercion is categorically incapable of becoming prohibited intervention.
UN declarations reflect wider opposition to coercive economic practices. The 1965 Declaration on the Inadmissibility of Intervention and the 1970 Friendly Relations Declaration condemn economic or political measures used to compel another State to subordinate the exercise of its sovereign rights (UN General Assembly, 1965; UN General Assembly, 1970). These resolutions are non-binding. They may contribute evidence relevant to customary law, but continuing disagreement in State practice prevents them from being treated as establishing a settled prohibition of all unilateral sanctions.
4.2 Retorsion, countermeasures, and secondary sanctions
Many unfriendly economic measures remain lawful because they constitute retorsion. A State generally does not need a special international-law justification to reduce discretionary assistance, decline certain commercial relations, or adopt another measure that breaches no obligation owed to the affected State.
Countermeasures are different. The ILC Articles on State Responsibility are not themselves a treaty, although many of their provisions codify or reflect customary international law. Under Articles 49–53, countermeasures respond to a prior internationally wrongful act and involve temporary non-performance of obligations toward the responsible State for the purpose of inducing compliance. They are subject to proportionality and procedural limits and are not legitimate merely because a government describes its sanctions as retaliatory measures (ILC, 2001).
Secondary sanctions raise additional issues because they seek to influence conduct beyond the sanctioning State’s territory. Measures threatening foreign banks, shipping companies, insurers, or other firms with exclusion from U.S. markets may generate disputes over jurisdiction, sovereignty, enforcement, and non-intervention. The ICJ’s 2021 preliminary-objections judgment confirmed that the involvement of third-country trade did not automatically place Iran’s claims outside the Treaty of Amity, but the Court did not rule that secondary sanctions as a category are unlawful (ICJ, 2021).
5. Third States Supporting U.S. Sanctions
The warning directed at countries supporting the U.S. economic campaign creates a distinct legal problem. A State that independently imposes restrictions on Iran is not legally equivalent to one implementing a binding Security Council decision, assisting U.S. enforcement, or merely permitting domestic companies to end Iranian transactions. Each State’s conduct must be assessed against the obligations binding upon it.
Private commercial decisions also require care. A bank or shipping company does not become an organ of its home State merely because it complies with U.S. sanctions. Attribution depends on the applicable rules, including whether the entity exercises governmental authority or acts under State direction or control. The State may nevertheless incur responsibility for its own legislation, instructions, or enforcement even where the private company’s conduct itself is not attributable to it (ILC, 2001, arts. 4, 5, 8).
Coordinated sanctions by multiple governments do not automatically resolve the question either. Article 54 of the ILC Articles deliberately leaves open the position of measures taken by States other than an injured State in response to breaches of obligations protecting collective interests. It does not itself authorize collective countermeasures; the ILC Commentary described relevant State practice as limited and still developing (ILC, 2001).
5.1 Responsibility for aiding or assisting sanctions
Article 16 of the ILC Articles addresses a different route to responsibility: one State may incur responsibility by aiding or assisting another State in the commission of an internationally wrongful act. The ICJ has recognized the rule reflected in Article 16 as customary international law (ICJ, 2007, para. 420).
Several conditions limit its reach. The assisted conduct must itself be internationally wrongful, and the assisting State must know the circumstances making that conduct wrongful. Article 16 also requires that the underlying act would be wrongful if committed by the assisting State itself. The ILC Commentary adds that assistance must actually facilitate the wrongful act and describes it as being provided with a view to facilitating that conduct (ILC, 2001). The precise role of intent beyond the knowledge requirement remains debated and should not be treated as conclusively settled.
Participation in a sanctions coalition is consequently insufficient by itself. A third State could also incur responsibility independently if its own asset freeze, trade restriction, or financial measure breaches an obligation binding upon it. That form of responsibility does not depend on Article 16 at all.
5.2 Sanctions and participation in armed conflict
Responsibility for an economic measure does not determine whether a State has become a party to an armed conflict. In an international armed conflict, the central criterion is resort to armed force between States. Economic sanctions, restrictions on banking, or commercial disengagement do not amount to such a resort merely because they assist one belligerent economically.
Even more direct support does not automatically produce party status. The ICRC states that supplying weapons or military equipment alone does not make a State a party to an armed conflict. In an existing IAC, a supporting State becomes a party where it itself resorts to armed force against another belligerent, including through effective involvement in military operations against that State (ICRC, 2024).
Economic participation falls further from that threshold. A State does not become a party to the U.S.-Iran conflict merely by adopting sanctions against Iran. Nor would responsibility for an unlawful economic measure, standing alone, give Iran a right to attack that State’s territory, armed forces, or civilian infrastructure.
6. What Iran May Lawfully Do in Response
If a particular sanction breaches an international obligation owed to Iran, Iran may have responses available without resorting to force. Depending on the circumstances, these could include diplomatic protest, adjudication or arbitration where jurisdiction exists, lawful retorsion, or countermeasures satisfying the requirements of State responsibility.
Forcible reprisals stand on a different footing. Article 50 of the ILC Articles provides that countermeasures may not affect the obligation to refrain from the threat or use of force contained in the UN Charter (ILC, 2001, art. 50). The Friendly Relations Declaration likewise requires States to refrain from reprisals involving force, and Nicaragua rejected the proposition that conduct falling below the armed-attack threshold could justify forcible collective countermeasures (UN General Assembly, 1970; ICJ, 1986).
Iran would consequently need an independent Article 51 basis for military self-defense. A sanction that violates a treaty, amounts to prohibited intervention, or constitutes another internationally wrongful act does not become an armed attack for that reason alone. The requirements governing self-defense—including the existence of a qualifying attack, necessity, and proportionality—remain separate.
The existing U.S.-Iran international armed conflict requires a narrow formulation of this conclusion. Current hostilities may give rise to other questions concerning the lawful use of force that are not determined by the sanctions dispute (Reuters, 2026). The point established here is only that non-forcible economic sanctions do not create an additional Article 51 entitlement merely because they are characterized as an “act of war.”
For third States involved exclusively in economic measures, the distinction is sharper. Sanctions participation alone does not make them parties to the existing conflict or authorize Iranian military action against them. A separate resort to armed force by such a State would raise a different legal question.
Iran’s restrictions on, and threats concerning, navigation through the Strait of Hormuz also belong to a separate legal framework. Measures affecting commercial navigation may engage the law of the sea, jus ad bellum, and, where an armed conflict applies, IHL. They cannot simply be treated as interchangeable economic countermeasures to U.S. sanctions.
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Conclusion
Calling U.S. sanctions on Iran an “act of war” does not give that phrase an operative legal effect under the UN Charter. Contemporary international law asks whether conduct constitutes a use of force and, for Article 51 self-defense, whether an armed attack has occurred. Non-forcible economic sanctions are not presently recognized as crossing those thresholds merely because their economic consequences are severe.
That conclusion says nothing categorical about the legality of every U.S. restriction. Individual sanctions may breach treaty obligations, exceed permissible jurisdiction, constitute prohibited intervention, or fail to meet the requirements governing countermeasures. Third-State participation can also raise independent questions of responsibility, particularly where another government adopts its own restrictions or knowingly assists conduct that is itself internationally wrongful.
What does not follow is a right to military retaliation. Economic participation alone does not make another State a party to the U.S.-Iran armed conflict, and an unlawful sanction does not automatically become an armed attack. Scholarly arguments for treating exceptionally destructive economic coercion more like force remain significant, but they have not displaced that distinction in current international law.
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