At the end of 2026, the United Nations Interim Force in Lebanon (UNIFIL) will cease operations after almost five decades, followed by an orderly withdrawal that can continue through 2027. Its departure will remove troops and observation posts, but it will also reshape the system of liaison, monitoring and crisis management that helps Lebanon and Israel manage incidents along the Blue Line, the UN demarcation line used to confirm Israel’s withdrawal from Lebanese territory.
This transition is already taking shape. The UN Secretary-General has presented three options for a continued UN presence after UNIFIL, while UN planning for 2027 envisages a continuing role for the UN Truce Supervision Organization (UNTSO) in observation, reporting, verification and liaison in southern Lebanon.
A parallel Trilateral Framework agreed by Lebanon and Israel with U.S. support links the expansion of Lebanese Armed Forces (LAF) control to verified disarmament and phased Israeli redeployment. European planning has advanced as well. In September, EU defence ministers discussed a new mission to advise and train the LAF in border and maritime security, with a Council decision on its launch targeted for October.
The question is consequently no longer simply who replaces UNIFIL. Lebanese forces are assuming greater responsibility for territorial security, the UN is preparing to retain monitoring and liaison functions, the United States is supporting a separate coordination and verification track, and the EU is developing its own role. The challenge is to make these parts fit together without creating overlapping responsibilities or gaps between them. 
This article asks where the EU fits within that emerging architecture. It argues for a clear division of labour in which Lebanese institutions lead territorial security, the UN preserves impartial monitoring and cross-border liaison, and European support concentrates on training, maritime and border capacity, surveillance and institutional assistance. The viability of this architecture will depend on giving each actor a distinct role and making those roles work together.
A mission is more than its mandate
UNIFIL’s significance lies in the functions attached to it. UN Security Council Resolution 1701 tasked the mission with monitoring the cessation of hostilities, supporting the deployment of the LAF, coordinating with Lebanon and Israel, and facilitating humanitarian access. It also instructed UNIFIL to assist the LAF in establishing an area between the Blue Line and the Litani River where armed personnel, assets and weapons belong only to the Lebanese state and UNIFIL. The mandate therefore links UNIFIL directly to the extension of Lebanese state authority in the south, while also allowing it to protect its personnel and civilians facing an imminent threat.
Some of UNIFIL’s most important work is less visible. In 2025, it recorded 1,390 deconfliction interactions with the IDF and facilitated 314 civilian and humanitarian movements. A later UN report recorded more than 9,000 such interactions.
Other functions are easier to place under Lebanese control. UNIFIL supports the LAF through training and joint operations. Its Maritime Task Force helped the Lebanese Navy assume responsibility for hailing and inspecting vessels. The mission also provided engineering, mine-clearance, and other technical support.
The tripartite meetings, however, show why some functions are harder to reproduce nationally. From 2006 to 2023, UNIFIL brought representatives from the LAF and IDF together to discuss tactical and operational incidents along the Blue Line. With no direct channel between the two militaries, UNIFIL acted as an intermediary. The meetings thus created a predictable forum for addressing incidents and containing escalation, but their military format kept wider political disputes outside the forum, including unresolved sovereignty questions and Hezbollah’s armed role in southern Lebanon. Hezbollah, the dominant non-state armed actor along the border, was not formally represented in the meetings, limiting their ability to address a central part of the security landscape. Israel has formerly conditioned the cessation of its actions in South Lebanon on the disarmament of Hezbollah, which the group refuses.
The distinction matters after UNIFIL. Lebanese institutions can increasingly assume maritime and technical tasks, while liaison, impartial observation and international reporting still require an actor accepted by all sides.
A transfer under pressure
Lebanese institutions are already assuming a larger security role. By February 2026, more than 9,000 LAF personnel were deployed south of the Litani River, while the Lebanese Navy had taken over all vessel hailing and inspections. Between October 2025 and February 2026, UNIFIL also conducted an average of over 1,200 operations each month in close coordination with Lebanese forces. These developments indicate that Lebanese institutions can already assume defined responsibilities.
The Trilateral Framework, agreed in June, gives that expansion a clearer sequence. In designated pilot zones, verified disarmament and dismantlement are intended to precede full LAF security responsibility and phased Israeli redeployment. This makes verification a distinct task within the emerging security architecture.
Progress, however, remains uneven. During the UN reporting period from October 2025 to February 2026, UNIFIL identified unauthorised weapons on 114 occasions. Seventy-three of these involved unguarded arms caches, containing stored weapons and ammunition. This illustrates the remaining gap between exclusive state control and conditions on the ground. At the same time, the LAF reported removing 98% of the caches referred to it by UNIFIL, showing it has the capacity to act on identified violations.
The security environment continues to test that progress. The same UN report recorded five Israeli positions and two buffer zones north of the Blue Line, alongside continued Israeli military activity and restrictions on UNIFIL movement. In early September 2026, the UN reported a renewed escalation, including 528 IDF projectiles over several days, 62 Israeli airspace violations in a single day, and further obstacles to peacekeeper movement. Lebanese forces are consequently assuming greater responsibility while territorial control and the cessation of hostilities remain contested.
Capacity, however, is only part of the problem. Lebanon’s security system combines formal state institutions with political, communal, and armed actors. Lebanese politics remain divided over whether coercive authority should rest exclusively with the state or also with armed resistance groups. Greater LAF capacity can strengthen state authority, but durable control also requires political agreement around it.
Local legitimacy adds another constraint. A study of Blue Line demarcations in Blida shows how border management can intersect with agricultural land, historical memory, and suspicion of external authority. Fieldwork across six South Lebanese communities found that many residents understood protection through familiarity, community ties, and local knowledge. Participants also described distrust towards state and humanitarian institutions and often relied on locals for support. For the EU, this suggests that technical capacity-building alone might not determine whether its assistance is locally accepted.
A durable post-UNIFIL order will depend on operational capacity, credible verification, political consent, and local trust, while retaining international mechanisms that help manage escalation.
Four tests for the post-UNIFIL architecture
What follows UNIFIL should be judged by what each institution can actually deliver. The withdrawal of a peacekeeping mission can be assessed through three criteria: whether an international presence is still needed, whether it is legitimate, and whether it can perform its tasks effectively.
For southern Lebanon, these become tests of continued need, legitimacy, and operational capacity. A fourth test, Lebanese ownership, draws on work on host-state consent and EU crisis-management practice. Here, ownership refers to the extent to which Lebanese actors shape the tasks, priorities and limits of external assistance. Together, the four tests allow the different parts of the emerging architecture to be compared on the same terms.
These tests also operate under a volatile security environment. The cessation of hostilities remains fragile, with renewed violence as recently as September 2026 and wider regional tensions still high. Escalation can quickly change both security needs and access.
The first test is continued need. An international presence remains justified where it addresses a credible risk of renewed violence or serious harm. In southern Lebanon, the question is whether a specific international function still helps reduce that risk. Communication between the parties, impartial observation, and de-escalation continue to serve that purpose as Lebanese institutions take on more territorial and maritime responsibilities.
The second test is legitimacy. Legitimacy depends on more than formal international approval. It also rests on acceptance among the people affected by a mission, which means considering both host-state consent and acceptance among affected communities. International authority has been interpreted differently by communities whose land, security, and historical experience intersect with UN activity. Any future arrangement will therefore need Lebanese government consent, international backing, and sufficient local acceptance to function.
The third test is operational capacity. An institution must have the personnel, equipment, access, and command arrangements required for its assigned tasks. UNIFIL’s Strategic Military Cell illustrates both sides of this problem. It strengthened planning, assessment, and coordination with troop contributors, yet its limited operational authority and contested position within the UN reduced its usefulness. In the current security climate, capacity also means being able to maintain access and coordination during renewed hostilities. Each task therefore needs a clear match between mandate, resources, and authority.
The fourth test is ownership. EU missions can endorse local ownership while remaining strongly shaped by external priorities. Early local participation and demand-driven mission design are stronger indicators that ownership is substantive. Host-state cooperation can also differ by function: support for state capacity may be easier to agree on, while monitoring, reporting, or oversight can prove more sensitive. The relevant test is whether Lebanese actors help define the tasks, priorities, and limits of outside assistance.
Three building blocks after UNIFIL
The four tests point to three components of the post-UNIFIL architecture: a reduced UN presence, a European CSDP mission and greater Lebanese responsibility. Each must remain workable during military escalation.
A reduced United Nations presence
The Secretary-General has proposed three options for a continued UN presence, ranging from about 5,500 uniformed personnel with substantial physical monitoring capacity to about 2,000 personnel relying more heavily on remote surveillance.
The case for continued UN involvement is clearest where functions still require an intermediary. Lebanese and Israeli military authorities rely on international channels for communication, while the UN remains the custodian of the Blue Line. Regular liaison has helped create predictability and contain individual incidents even when political hostility persisted. UNTSO also provides a degree of continuity. UN planning envisages continued observation, reporting, investigation, verification and liaison in southern Lebanon, and coordination between UNIFIL and UNTSO has been under way since late last year.
A smaller UN presence would have less reach for continuous observation and liaison, while the continued military presence and unexploded ordnance already restrict UNTSO movement. Technical surveillance can compensate for some gaps, but remote and aerial warfare can also bypass ground-based monitoring. Its operational reach will depend on scale, access and the security climate.
A European CSDP mission
The EU is now planning a mission of its own. In September 2026, EU defence ministers considered plans for a mission to advise and train the LAF, including in border and maritime security. Planning was described as advanced, with a Council decision on launch targeted for October. Existing European assistance already supports surveillance, maritime command and control, counter-drone capabilities, medical equipment and training through a €100 million European Peace Facility measure.
The EU’s clearest case lies in capacity-building. Training, border management and maritime support match areas in which European assistance is already established and in which Lebanese institutions are assuming greater responsibility. The security environment also aids a supporting mandate rather than a larger replacement force. A mission focused on advice and capability-building would require a smaller operational footprint and could strengthen Lebanese forces without duplicating UN liaison and reporting.
Legitimacy and ownership are less straightforward. EU planning has involved consultation with the Lebanese government, giving the proposed mission a clearer basis in Lebanese demand. At the same time, experience from other CSDP operations shows that local ownership can weaken when available European capabilities shape the mission more strongly than local demand. Its legitimacy will therefore depend partly on whether Lebanese priorities continue to shape the mandate.
Lebanese leadership with external support
Lebanese leadership has a strong basis in sovereignty and ownership. Resolution 2790 calls for the Lebanese government to become the sole provider of security in the south, while the LAF has expanded its presence, increased coordinated operations, and taken over maritime functions. The Trilateral Framework adds a concrete sequence through pilot zones in which the LAF is expected to assume full security responsibility after verified disarmament and dismantlement of non-state military infrastructure.
This gives Lebanese leadership the strongest claim on ownership, although legitimacy extends beyond state consent. Attitudes toward state and international security structures vary across southern Lebanon. Its credibility will also depend on performance and local acceptance.
Capacity also remains uneven. The LAF can increasingly perform patrol, border and maritime tasks, yet those responsibilities are being assumed under continued military pressure. Israeli military activity, contested territorial control and recurring restrictions on international movement continue to complicate operations. Continued external equipment, financing and training remain important. Other functions remain harder to nationalise. Cross-Blue Line liaison and internationally recognised reporting require an actor that can communicate with both parties and retain external political authority.
Taken together, the tests point towards a layered architecture rather than a single successor to UNIFIL. Lebanese institutions have the strongest claim to territorial security, the UN to impartial monitoring and liaison, and the EU to strengthen Lebanese capacity. The central question is how to connect those roles without allowing them to overlap.
The EU’s role after UNIFIL
Within this emerging division of labour, the EU’s clearest role is to strengthen Lebanese capacity. The planned CSDP mission offers a way to turn that role into practice.
A focused mandate would centre on border and maritime security, military planning and the use of surveillance systems. Blue Line monitoring, liaison between Lebanon and Israel, and international reporting are already covered by the UN. The Trilateral Framework creates a separate process for verifying disarmament and Israeli redeployment. Extending the EU mission into either area would risk duplicating mechanisms already in place or under development.
European assistance could instead concentrate on turning equipment into usable Lebanese capabilities. The European Peace Facility already supports surveillance, maritime and training capabilities. Their longer-term value will depend on the personnel, maintenance and procedures around them. Drone support, for example, requires trained operators, the capacity to analyse collected information and procedures for feeding it into Lebanese command structures. Maritime equipment likewise needs command procedures, exercises and technical support if the Lebanese Navy is to sustain these capabilities independently.
Existing safeguards offer one way to assess whether this support is taking hold. Delivery checks, annual reporting, on-site inspections, and final evaluation are already required. These mechanisms could also track whether supplied systems remain operational, trained Lebanese units can use them without outside personnel,and whether information generated by them reaches the institutions responsible for acting on it.
The pilot zones created by the Trilateral Framework offer a place to concentrate this support. In these areas, verified disarmament and dismantlement are intended to precede full LAF security responsibility, Israeli redeployment and civilian return. Training and equipment directed towards the Lebanese units assigned to these zones would connect European assistance to specific gains in Lebanese territorial control, while verification remains with the mechanisms established under the Framework.
Clear working arrangements will matter alongside the mandate itself. The LAF, UNTSO, the EU mission, and the U.S.-supported coordination mechanisms are likely to operate in overlapping institutional and geographic spaces. Agreed procedures for information-sharing, incident reporting, and referral could reduce duplication and clarify who follows up on different types of incidents. Each function would then have a clearer lead actor and referral route.
The wider European role also has a local dimension. Fieldwork in six South Lebanese communities found that residents often relied on municipalities, families, and local networks for civilian and administrative support during periods of fighting. Municipalities could consequently be involved in emergency communication, civilian movement, medical access and preparations for return in areas where Lebanese forces assume greater responsibility. Such support fits better within the EU’s wider assistance programmes, leaving the CSDP mission focused on security-sector capacity.
The present security environment gives further reason to keep the European role focused. Renewed hostilities have already restricted access and temporarily forced Lebanese forces away from some areas near the Blue Line. Patrols or direct monitoring could expose a European mission to similar constraints and could duplicate functions already covered through UN channels. Advice, training and institutional support remain useful even when access to contested areas becomes more difficult.
This leaves the EU with a substantial but bounded role. Its contribution lies in making greater Lebanese responsibility workable through training, equipment and institutional support, while UN mechanisms continue to provide impartial monitoring and liaison. Success would be measured by whether Lebanese institutions can sustain these capabilities with less external assistance.
The post-UNIFIL order is already taking shape around several actors rather than a single successor mission. Its credibility will depend on keeping their roles distinct while connecting them closely enough to avoid gaps and duplication. If that division holds, UNIFIL’s departure can mark a shift towards greater Lebanese responsibility without losing the international mechanisms that still help contain escalation.
*AI was used for linguistic refinement
