Hezbollah Disarmament in Lebanon: What Would International Law Allow?
- Edmarverson A. Santos
- 15 minutes ago
- 15 min read
Introduction
In the first week of August 2026, Lebanese and Israeli negotiators meeting at the United States embassy in Rome agreed on a shortlist of countries that could send troops to verify Hezbollah's disarmament, with Washington expected to choose the participants from that list (Gebeily, 2026). The proposal moves Hezbollah disarmament in Lebanon from the realm of political demands into operational planning, and it sharpens a question the diplomacy has so far avoided answering: what would international law actually permit such a force to do?
The answer turns on a distinction that sounds technical but controls everything else. A mission that verifies disarmament—observing, inspecting by agreement, certifying the destruction of weapons, reporting compliance—can rest on Lebanon's consent alone. A mission expected to impose disarmament on an armed group that has refused it would need coercive legal authority that nobody has yet proposed to confer, and that Lebanon itself may be unwilling to request. Most of the unresolved design choices, from the role of UNIFIL to the rules of engagement, sit downstream of that line.
1. The June 26 Framework and the Proposed Verification Force
1.1 What the Trilateral Framework Provides
On June 26, 2026, Israel and Lebanon signed a trilateral framework with the United States in Washington, the first accord between the two states since the short-lived agreement of May 17, 1983 (United States Department of State, 2026). Its operative core is a reciprocal, sequenced bargain: the Lebanese Armed Forces (LAF) are to restore effective sovereign authority over all Lebanese territory, pending the verified disarmament of non-state armed groups and the dismantlement of their associated infrastructure, while the Israel Defense Forces progressively redeploy out of Lebanese territory as each stage is verified.
The framework designates initial pilot zones in southern Lebanon where this sequence is to be tested. Once disarmament and dismantlement in a zone are confirmed, the LAF assumes full and effective security responsibility, internationally supported reconstruction begins, and civilians return under exclusive Lebanese state control (Al Jazeera, 2026). Verification by a third party and international assistance are built into the design. Israeli withdrawal is conditioned on verified performance, not on the calendar; the framework sets no timeline.
1.2 Confirmed Elements and Open Questions
What is actually confirmed about the force is thin. A shortlist of potential troop contributors exists, and the United States will select from it. Beirut rejected an earlier proposal to use private security companies as the third-party verifier, and Israel and the United States reportedly vetoed France's participation (Gebeily, 2026). Everything that would define the mission in legal terms remains unresolved: the participating states, the size of the force, its command structure, its mandate, its rules of engagement, and its institutional framework—housing under UNIFIL, a separate United Nations arrangement, or a memorandum of understanding with Lebanon are all still in play.
That indeterminacy is not a detail. Each open item selects a different body of law, and several of the options are mutually exclusive.
1.3 Hezbollah's Rejection
Hezbollah is not a party to the framework and rejects both disarmament and any foreign role in the question. Its secretary-general, Naim Qassem, has declared that any project to remove the weapons of the so-called resistance "will not pass," dismissed the pilot-zone concept outright, and insisted that the arsenal is an internal Lebanese matter beyond the reach of negotiations with Israel (This Is Beirut, 2026). When the Lebanese cabinet tasked the army in 2025 with planning nationwide disarmament, the group announced it would treat the decision as if it did not exist. Any legal design must start from this fact: the entity to be disarmed has consented to nothing.
2. Lebanese Consent as the Legal Basis for Foreign Troops
2.1 Intervention by Invitation
The starting point is Article 2(4) of the UN Charter and the customary prohibition of intervention. Neither is breached by foreign troops in Lebanon that the Lebanese state has validly invited. The International Court of Justice recognized in the Nicaragua judgment that intervention is permissible at the request of the government of a state, and in Armed Activities on the Territory of the Congo it treated consent as a legal basis that defines the permissible scope of a foreign presence and can be withdrawn at any time (ICJ, 1986; ICJ, 2005). The International Law Commission's articles on state responsibility generalize the point: valid consent precludes the wrongfulness of conduct that remains within the limits of that consent (International Law Commission, 2001, art. 20).
Three consequences follow. Lebanese consent by itself is a sufficient international legal basis for a foreign verification presence; no Security Council action is needed for that. The mission's lawful powers extend only as far as the consent does, so the invitation instrument effectively is the mandate. And the basis is revocable—a change of government or of political alignment in Beirut could end it.
One doctrinal caution is in order. The Institut de Droit International's 2011 resolution on military assistance on request accepts aid to a requesting government but excludes assistance whose object is to settle an internal political conflict by force (Institut de Droit International, 2011). A verification mission stays on the right side of that line. A foreign force fighting Hezbollah on the government's behalf arguably would not.
2.2 Who May Consent for Lebanon
Consent counts internationally only when it comes from the state's competent authorities. Under the Lebanese Constitution, the President negotiates and ratifies international agreements in agreement with the Prime Minister, certain categories require parliamentary approval, and international agreements rank among the basic national issues on which the Council of Ministers must decide by a two-thirds majority (Constitution of Lebanon, 1926, arts 52 and 65).
Those thresholds are not formalities. Lebanon's confessional system gives ministers aligned with Hezbollah and the Amal Movement the ability to contest, boycott, or delegitimize a cabinet decision inviting foreign troops, even where the votes exist. The National Pact tradition, under which major decisions require cross-communal participation, would be invoked against any invitation adopted over a Shia walkout.
International law softens the domestic risk without erasing it. By the logic of Article 46 of the Vienna Convention on the Law of Treaties (1969), a state cannot invoke its internal law to escape its consent unless the violation was manifest and concerned a rule of fundamental importance. An invitation issued by the President and cabinet would almost certainly bind Lebanon internationally even if contested at home. The contest would still matter, because consent that survives as law but collapses as politics cannot sustain a deployment.
2.3 Invitation Versus Security Council Authorization
An invited force and a Council-created force are different legal creatures. A consensual mission derives every power from the invitation, binds no third state, and ends when Beirut says so. A mission established or authorized by the Security Council rests on the Council's powers under the UN Charter; its decisions bind all member states under Article 25 and prevail over conflicting treaty obligations under Article 103 (United Nations, 1945). Authorization also insulates the presence from shifts in Lebanese politics. Classical peacekeeping itself, as the International Court described the first UN Emergency Force, was a consensual and non-coercive activity rather than enforcement (ICJ, 1962), so the two models can shade into each other; the source of authority is what separates them.
Is a new Security Council resolution legally required? For a consensual verification mission, no. The Multinational Force and Observers has verified the security annexes of the Egypt–Israel peace treaty since 1982 with no UN mandate at all, created by the parties after a Council resolution proved unattainable (Protocol to the Treaty of Peace, 1981). A resolution becomes a legal necessity in two situations only: if the mission is to exercise enforcement powers, or if it is to be built out of UNIFIL, whose mandate only the Council can change. The other things a resolution would supply—assessed financing, permanence, obligations on third states, legitimacy against the charge of occupation—are politically weighty but not legal preconditions.
3. UNIFIL as the Institutional Vehicle
3.1 The Scope of Resolution 1701
UNIFIL was created in 1978 to confirm Israeli withdrawal and assist the restoration of Lebanese authority in the south (UN Security Council, 1978). Resolution 1701, adopted after the 2006 war, enlarged the force and rewrote its tasks: monitoring the cessation of hostilities, accompanying and supporting the LAF as it deployed through the south, and assisting the government, at its request, to secure borders against unauthorized arms transfers. The resolution required the area between the Blue Line and the Litani River to be free of armed personnel and weapons other than those of the Lebanese state and UNIFIL (UN Security Council, 2006).
What 1701 never did was order UNIFIL to disarm anyone. The disarmament of all armed groups in Lebanon appears in the resolution as an element of the envisaged long-term solution, carried forward from Resolution 1559 and the Taif settlement, and its execution was left to the Lebanese state (UN Security Council, 2004; 2006). Mission practice followed the text: UNIFIL does not search private property on its own authority and operates alongside or in support of the LAF.
3.2 Why Verifying Hezbollah Disarmament Exceeds the Mandate
Measured against systematic verification of Hezbollah disarmament, the existing mandate falls short twice over. Geographically, UNIFIL's area of operations lies south of the Litani, while much of Hezbollah's arsenal sits north of it, in the Bekaa Valley and around Beirut. Functionally, certifying nationwide disarmament as the trigger for Israeli redeployment under a trilateral framework is a different undertaking from assisting an LAF deployment at Lebanon's request. Substantially expanding a UN mission's functions is the Security Council's prerogative; neither the Secretariat nor the parties can repurpose UNIFIL by side agreement.
3.3 Resolution 2790 and the December 2026 Terminus
Resolution 2790 forecloses the easy version of that fix. Adopted unanimously on 28 August 2025, it extended UNIFIL's mandate for a final time until 31 December 2026 and directed the mission to cease operations on that date and complete an orderly withdrawal within a year (UN Security Council, 2025). Housing verification troops under UNIFIL, an option aired in the current talks (Gebeily, 2026), would therefore require the Council to reopen a decision it framed as terminal. That is a new resolution in all but name. If verification continues beyond 2026, the realistic vehicles are a successor UN mission created by a fresh resolution, or a non-UN presence resting on Lebanese consent and a bilateral status agreement. There is no institutional default waiting to be used.
4. Verification of Disarmament Versus Forcible Disarmament
4.1 What Non-Coercive Verification May Lawfully Involve
Non-coercive verification is a settled craft. It includes observation and patrols; inspections of declared sites by agreement; monitoring of weapons transfers along borders and supply routes; witnessing and certifying the surrender, removal, or destruction of weapons and associated infrastructure; and reporting compliance to the parties and to any joint mechanism. All of this fits within Lebanese consent. None of it requires power over persons or property.
4.2 The Coercive Threshold
The analysis changes at the coercive threshold. Compulsory searches of Hezbollah facilities, entry into private or military premises without the cooperation of Hezbollah or the Lebanese authorities, confiscation or destruction of weapons by foreign hands, and the arrest, restraint, or detention of Hezbollah members are enforcement acts. Lebanon could in principle consent to foreign personnel exercising such police powers on its territory. Executing them against an organized armed group that has promised resistance would be combat in everything but name. Detention adds a further layer: deprivation of liberty requires a legal basis and review under Article 9 of the International Covenant on Civil and Political Rights (1966), obligations that foreign contingents without a policing mandate are poorly placed to discharge.
The coherent allocation keeps coercion with the Lebanese Armed Forces. Sovereign enforcement is performed by the sovereign's organs; international personnel observe, certify, and report. That division also answers the hardest operational question. If Hezbollah refuses access to inspectors or refuses to surrender weapons, the mission records the refusal and reports non-compliance. The consequences then run through the framework's sequencing, since Israeli redeployment stalls, and through Lebanese domestic enforcement. They do not run through the verifiers' own rifles.
4.3 The Legal Weight of Hezbollah's Non-Consent
Hezbollah's refusal affects less than is commonly assumed, and more. As to the mission's legality: nothing. The lawfulness of a foreign military presence is a question between states; it turns on Lebanon's invitation or a Council mandate, and a non-state armed group holds no veto in international law (Crawford, 2019). Hezbollah is bound by Lebanese law, including any disarmament decision of the Lebanese state, and by international humanitarian law in armed conflict. It is not bound by the June framework, an instrument among the United States, Israel, and Lebanon to which it is a stranger; Lebanon's own obligation to disarm militias predates that instrument in any event (UN Security Council, 2004). What the group's rejection does control is the separate legality of coercive measures against it, and the mission's practical prospects.
5. Use of Force by the Foreign Contingents
Peacekeeping doctrine distinguishes several kinds of force: self-defense of personnel, defense of the mission and its freedom of movement, and protection of civilians under imminent threat. Each is compatible with a consensual, impartial presence (United Nations Department of Peacekeeping Operations, 2008). Force used directly to compel disarmament belongs to a different category, enforcement, which the Council authorizes with the words all necessary measures under Chapter VII.
Rules of engagement do not bridge that gap. ROE are operational directives that restrict when soldiers may open fire; they distribute authority that must already exist in the mandate, the invitation, or the Charter, and they cannot create it (Findlay, 2002). A verification force whose ROE purported to permit offensive operations against Hezbollah would be acting without any legal basis currently in prospect. If the mission were genuinely expected to use military force against the group, only a Chapter VII authorization, on top of Lebanese consent, could supply the authority.
An attack on the force changes the analysis in stages. Isolated attacks engage personal and unit self-defense, and attacking peacekeepers is criminalized under the Convention on the Safety of United Nations and Associated Personnel (1994) where it applies. Sustained armed confrontation is different in kind. Once fighting with an organized armed group crosses the intensity threshold, the foreign contingents become a party to a non-international armed conflict. International humanitarian law then governs their operations, as the Secretary-General's Bulletin confirms for UN forces (UN Secretary-General, 1999), and their military members lose civilian protection and become lawful targets for the duration. A mission built to certify a ceasefire would have become a belligerent inside it. Avoiding that trajectory is the strongest argument for keeping the force's tasks strictly non-coercive.
6. Compliance, Conditionality, and Disputes
The framework conditions Israeli redeployment on verified disarmament, stage by stage, and supplies sequencing rather than deadlines (United States Department of State, 2026). Whether that conditionality is legal or merely political depends on the instrument's status, which the parties left with convenient ambiguity: a signed framework may or may not have been intended to create obligations binding in international law. The practical structure is the same either way. Withdrawal is performance-based, and the verifier's findings decide whether performance occurred.
Who makes that finding is unresolved, and it is the design's most consequential gap. The candidates are the verification force itself, a joint body on the model of the mechanism that has monitored the November 2024 cessation of hostilities under United States chairmanship, or each party judging unilaterally, which is the destabilizing default. The object of verification is equally open. Disarmament could mean the complete surrender of Hezbollah's arsenal, the removal of heavy weapons and missile systems, withdrawal from defined zones, dismantlement of production and storage infrastructure, or a sequenced combination; the framework speaks of non-state armed groups and associated infrastructure without a schedule of what counts. The evidentiary methodology, from declarations and baselines to inspection sampling and standards of proof, remains to be built, and with it a procedure for resolving disagreement between Lebanon and Israel over whether a given zone is clean.
7. Command, Responsibility, and the Status of Foreign Personnel
7.1 Command Structures and International Responsibility
Command arrangements decide who answers when things go wrong. The mission could operate under UN command and control, under a multinational headquarters led by one state, or as national contingents held together by coordination arrangements. Attribution of conduct follows control. Under the International Law Commission's articles on the responsibility of international organizations, the conduct of a contingent placed at an organization's disposal is attributed according to effective control over the conduct in question, and acts beyond the mandate remain attributable rather than vanishing as ultra vires (International Law Commission, 2011, arts 7 and 8).
Courts have divided over how this works. The European Court of Human Rights attributed the conduct of KFOR in Kosovo to the United Nations on an ultimate authority and control theory (ECtHR, 2007), then declined to extend that reasoning to British detention operations in Iraq (ECtHR, 2011). The Dutch Supreme Court accepted that the same conduct of a national contingent can be attributed to the sending state and the United Nations at once (Supreme Court of the Netherlands, 2013). For unlawful killings, excessive force, unlawful searches, wrongful detention, or property destruction, the working rule is simple: the tighter a state's control over its troops, the more surely responsibility is its own. Troop contributors and any UN framework should expect overlapping exposure, which is precisely why the command chart is a legal document and not an organogram.
7.2 Status of Forces, Jurisdiction, and Claims
Foreign personnel also need a defined legal status inside Lebanon. UN operations conclude a status-of-forces agreement on the model of the Secretary-General's 1990 template: exclusive sending-state criminal jurisdiction over military members, functional privileges and immunities, and standing claims commissions for third-party injury and property damage (United Nations, 1990). A force outside the UN framework would need an equivalent instrument negotiated with Beirut; without one, its soldiers stand under ordinary Lebanese criminal and civil jurisdiction. However constituted, the presence must support rather than displace Lebanese sovereign authority, and its day-to-day relationship with the LAF, from liaison to joint planning, is where that principle is either honored or hollowed out.
8. Institutional Models and the Legally Safest Design
Five institutional models cover the realistic field.
Model | Legal basis | Principal legal weakness |
Expanded UNIFIL | New Security Council resolution revising 1701 and 2790 | The Council must reverse a decision it framed as final; veto exposure |
Successor UN mission | New Security Council resolution | Veto exposure; UN command may not satisfy Israel or the United States |
Council-authorized multinational force | Chapter VII authorization plus Lebanese consent | Veto exposure; mandate creep toward enforcement |
Lebanon-invited multinational force | Lebanese consent plus a status-of-forces instrument | Consent revocable and domestically contested; no Article 103 cover |
International monitors beside Lebanese enforcement | Lebanese consent | Delivery depends wholly on LAF capacity and will |
Ranked by legal exposure, the last model is the safest: international personnel confined to verification while Lebanese forces conduct whatever coercive disarmament occurs. It requires no Council action, generates no enforcement liability, keeps foreign troops out of combat roles, and aligns the legal design with the constitutional principle that only the Lebanese state may exercise force on Lebanese soil. Its weakness is candor itself: it can only certify what Lebanon actually does.
Whichever model is chosen, the same limits apply. The mission needs valid consent or Council authority; a mandate that states what the force may and may not do; coercive powers defined in advance and preferably reserved to Lebanon; use-of-force authority that matches the mandate rather than the rules of engagement; command arrangements clear enough to fix responsibility; a status agreement covering jurisdiction, immunities, and claims; and compliance with human rights law and, if fighting comes, humanitarian law.
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Conclusion
International law would allow more than Hezbollah's rhetoric concedes and less than the framework's sequencing quietly assumes. Lebanon's consent is a complete legal foundation for foreign troops that observe, inspect by agreement, and certify; no Security Council resolution is required for that, though one becomes unavoidable the moment UNIFIL is the vehicle or enforcement is contemplated, and Resolution 2790 makes the UNIFIL route impossible without fresh Council action in any scenario.
Nothing now on the table would lawfully authorize foreign contingents to search, seize, detain, or disarm by force. A mission drawn into sustained fighting with Hezbollah would trade the law of peacekeeping for the law of armed conflict, and its members would become targets. The verification force can attest to disarmament that the Lebanese state achieves. It cannot lawfully deliver that disarmament itself, and no rules of engagement can be written that change this.
Three questions will decide whether the arrangement holds, and none is answered yet: who certifies compliance and by what standard, what disarmament actually means as a schedule of weapons and territory, and which institution carries verification after UNIFIL's mandate ends on 31 December 2026. Until they are answered, the legal architecture remains a sketch resting on a single load-bearing element, the continuing consent of a divided Lebanese state.
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