IDF declares new combat zones in southern Lebanon, testing the limits of a fragile ceasefire

Israeli forces moved overnight into what the IDF now officially calls a new combat zone in southern Lebanon. On Wednesday, 28 May 2026, the Israeli military issued evacuation orders covering areas south of the Zahrani River — a waterway that bisects the southern Lebanese coastal plain — and parts of the city of Tyre. The orders, broadcast in Hebrew and Arabic via the IDF Spokesperson's Arabic-language account, apply to at least two distinct zones: the eastern and southern outskirts of Tyre itself, and the area around Zqaq al-Mafda further inland. This is the most significant expansion of the Israeli offensive since a ceasefire took effect in April 2025, an agreement that both parties had, as recently as a month ago, publicly committed to defending.

The ceasefire, brokered after eighteen months of cross-border hostilities that displaced tens of thousands on both sides of the frontier, established a framework the IDF claims was already eroding before the current escalation. What the military now calls a combat zone was, under the agreement's terms, supposed to be a monitored buffer — a space where Lebanese state institutions, rather than armed groups, would be the only authority. Instead, Israeli forces have been operating there for months in ways that the IDF itself frames as enforcement against what it describes as ongoing ceasefire violations. On Wednesday, they drew a new perimeter. The question is whether the ceasefire that has kept the frontier quieter than at any point since October 2023 can survive what Israel has just done to it.

The operational picture: what the IDF has declared

The evacuation orders are specific and they are sweeping. South of the Zahrani River — which runs from the eastern hills to the sea roughly 70 kilometres south of the Lebanese-Israeli frontier — residents are being told to leave immediately. The IDF cited, in its statements, the presence of what it describes as Hezbollah military activity in the area. The phrasing matters: the IDF did not say the ceasefire was over, nor did it announce a formal end to the agreement's enforcement mechanism. What it did was declare a zone off-limits to civilians and then begin operating inside it. That distinction — between formally abandoning a ceasefire and practically undermining one — is at the heart of what makes this escalation ambiguous and therefore harder to pressure either party on.

The IDF's statements made clear that strikes were ongoing and that forces would remain in the area. According to the military, the operations target what it characterises as Hezbollah infrastructure embedded in or near civilian areas — a charge the group and its allies in Lebanon dispute, but which aligns with the IDF's longstanding position that the ceasefire failed to fully disarm the group in the south. The April 2025 agreement was always imperfect, built on assumptions about monitoring and verification that international observers acknowledged were weak. What Israel is now doing suggests it has decided those assumptions were wrong, and that living with a flawed ceasefire is less useful than acting unilaterally to enforce its own red lines.

Humanitarian organisations operating in southern Lebanon report significant civilian displacement as a result of the new evacuation orders. The affected areas include villages and urban neighbourhoods that had only recently seen residents return after the ceasefire brought a pause to the worst of the fighting. Sources in Tyre describe a city whose eastern and southern approaches are now essentially empty of civilian life, with aid organisations struggling to access displaced populations in areas the IDF has designated as active combat zones.

Ceasefire violations and the disputed question of enforcement

Both sides to the April 2025 ceasefire have accused the other of violations since the agreement took effect, and the argument has been running in circles for more than a year. Israel says Hezbollah has continued to fortify positions, move weapons, and conduct intelligence operations in the south — all prohibited under the ceasefire's terms. Hezbollah says it has the right to respond to Israeli provocations and that the IDF's periodic operations constitute violations in themselves. The UN peacekeeping force deployed along the Blue Line under Resolution 1701 — UNIFIL — has repeatedly flagged incidents on both sides without being able to compel compliance. The ceasefire held, barely, through most of its first year. What Israel has just done may represent the moment when holding gave way.

The IDF's framing is significant. The military has not declared the ceasefire null and void. It has instead issued evacuation orders and announced active operations in designated zones — a distinction that matters legally and diplomatically, because it means the official position is that the ceasefire still exists while the practical reality is that it has been set aside in the areas Israel has now designated as combat zones. Hezbollah, for its part, has not formally responded with the kind of large-scale retaliation that would constitute a full breakdown. That may change. But right now the picture is more one of managed erosion than dramatic collapse — which is itself a form of escalation, because it signals that the IDF is prepared to expand its footprint without waiting for either a Hezbollah violation large enough to justify it or an international green light.

The question of what the IDF means by "Hezbollah activity" in the evacuation zones is genuinely contested. Lebanese government officials and international monitors have disputed Israeli characterisations of specific incidents. Without a robust verification mechanism — which the April ceasefire explicitly lacked — each side operates on its own reading of what the agreement permits. Israel has chosen to enforce its own reading by moving forces into areas it says are compromised. Hezbollah says it has not violated the ceasefire and that Israeli operations are themselves a breach. The truth, almost certainly, is that both things are partially true — which is what makes this situation so difficult for international mediators to resolve.

The diplomatic collapse and what the international community can or cannot do

The ceasefire was not simply a bilateral arrangement. It was brokered with international involvement, embedded in UN Security Council discussions, and supported by an array of diplomatic actors who invested significant political capital in getting both sides to stop fighting. That architecture is now being tested in a way it was not designed to withstand. The IDF's decision to declare new combat zones was not preceded by a notification to the mediating parties, according to available accounts. This was a unilateral move by Israel — one that, if it holds, effectively rewrites the territorial assumptions the ceasefire was built on.

International reaction has been cautious, which is to say inadequate. The Security Council is deadlocked, as it has been on this conflict for years — the composition of the council means that meaningful enforcement action against Israel, even if technically possible, is politically out of reach. European governments have expressed concern. The United States, which played a central role in brokering the original ceasefire, has given no public indication of pressing Israel to reverse course. The pattern — unilateral Israeli escalation followed by a period of international hand-wringing that produces no concrete pressure — has become familiar enough that it functions almost as a template. Each iteration makes the next one easier.

The UNIFIL mission faces a practical problem: it is mandated to maintain the ceasefire but lacks the enforcement authority to do so when one party decides to operate outside the agreement's parameters. Peacekeepers in southern Lebanon have reported incidents that amount to IDF operations in areas where, under the ceasefire's terms, they should not be present. The international legal framework governing UNIFIL's presence has been strained but not formally breached — because the IDF's actions, however destabilising, stop short of explicitly contradicting the mandate's letter. That legal distinction is cold comfort to the civilians caught inside a zone the IDF has just declared off-limits.

Structural consequences and the question of Lebanese sovereignty

The April ceasefire, whatever its flaws, gave Lebanon something it had not had in years: the prospect of a period of relative quiet in which the state could attempt to reassert its authority in the south. That prospect is now in doubt. The IDF's expanded operations are taking place in areas that, under the ceasefire's terms, were supposed to be under Lebanese state authority. Instead, Israel is operating there unilaterally, without Lebanese government consent, without effective international constraint, and — if the evacuation orders hold — without the civilian population that would make any claim of Lebanese sovereignty over the area meaningful.

Lebanon's government has protested the Israeli operations, as it has протестовано against every IDF incursion since the original ground campaign began in late 2024. But the Lebanese Armed Forces are not in a position to contest Israeli moves militarily. The state lacks the capability, and any attempt to enforce sovereignty through force would be met with Israeli firepower that Lebanon cannot match. So the government protests, and Israel continues to operate, and the areas being declared combat zones are effectively beyond Lebanese control — not because Hezbollah has seized them, but because Israel has taken them.

This dynamic has a structural logic that is worth spelling out. The ceasefire was designed to create a buffer in which Lebanese sovereignty could gradually be established. What Israel is now doing, with the expanded combat zone declarations, is making that buffer Israeli-controlled rather than Lebanese-controlled. Whether or not the IDF intends this as a permanent reconfiguration of the territory — whether this is tactical enforcement or strategic redeployment — the practical effect is the same: the south of Lebanon is being reorganised around Israeli security assumptions, not Lebanese state authority. The ceasefire was supposed to change that. It has not.

Stakes and what comes next

The IDF's expanded combat zone declarations are not a temporary adjustment. The military has positioned forces in areas it says it will operate in, and it has told civilians to leave. That is not a posture that reverses easily. Even if the current operation concludes without a formal breakdown of the ceasefire, the precedent matters: Israel has demonstrated that it will expand its footprint when it decides its security requires it, regardless of what the ceasefire's terms say. Hezbollah has noted this. The group has so far responded with measured force — the kind of calibrated pressure that allows both sides to avoid the full-scale re-escalation neither may want — but that calculation depends on Hezbollah believing the current Israeli operations are containable. If they are not, or if they expand further, the response will change.

The ceasefire that Israel and Hezbollah reached in April 2025 was fragile. It was built on assumptions neither side fully trusted. It survived because both parties, for different reasons, concluded that survival was preferable to going back to full-scale hostilities. What Israel has just done puts that calculation under pressure. The IDF is taking territory. It is not apologizing for it. It is not consulting with the ceasefire's guarantors. It is acting as though the agreement is a speed limit it observes when convenient and ignores when the road feels dangerous — which, in the end, is what a ceasefire is when one side has overwhelming military superiority and no effective check on how it uses it.

The international community's options are limited. The Security Council framework that underpins UNIFIL and the broader ceasefire architecture has been strained before and recovered. But recovery required both parties to want it, and right now only one of them does — Lebanon, which has the least leverage of any party in this arrangement. The ceasefire may survive in form even as it is hollowed out in practice. That is, historically, what weak agreements do when a stronger party decides they no longer serve its purposes.

What happens next depends on whether the IDF stops where it has declared, whether Hezbollah accepts the new perimeter, and whether any actor with genuine leverage on Israel decides to use it. On the evidence of the past fourteen months, the answer to the third question is no. Which means the ceasefire endures, in whatever form remains — until it does not.

This article is based on reporting from IDF spokesperson statements, France24 English, and the French-language France24 Telegram channel. Monexus notes that no international wire services appear in the available source feed for this story; coverage relies on IDF-sourced statements and reporting from France24. The disparity between what the IDF says it is doing and what independent verification of its claims is available reflects a consistent gap in the documentation of operations in southern Lebanon.

Wire provenance

This editorial synthesis draws on the following public wire/social posts:

• https://t.me/france24_en/58278
• https://t.me/France24_fr/46712
• https://t.me/wfwitness/38941