- Lead. A provisional Israel-Lebanon ceasefire collapsed within hours of its announcement on June 4, after Hezbollah leader Naim Kassem called the terms “absurd, humiliating and insulting” — rejecting any truce that did not begin with Israeli military withdrawal.
- Fact. A Serbian UNIFIL peacekeeper was killed by mortar fire near Marjayoun on June 3, bringing total UN peacekeeper deaths in Lebanon since March to seven; Spanish and Salvadoran peacekeepers were also wounded.
- Stake. Lebanese President Joseph Aoun said the deal was the “last chance” for a comprehensive truce — a phrase that, with Hezbollah’s rejection and continued Israeli strikes, now marks the collapse of the most advanced ceasefire attempt since fighting escalated this year.
What was agreed — and who broke it
Israel and Lebanon provisionally agreed to a ceasefire announced in Washington, with terms requiring Hezbollah — but not Israeli forces — to halt attacks, and the creation of a demilitarized zone in southern Lebanon to be administered by the Lebanese national army. Lebanese President Joseph Aoun, speaking on June 4, said the deal would take effect within 24 hours of all parties approving it and called it the “last chance” to reach a comprehensive truce.
Within hours, Hezbollah Secretary-General Naim Kassem rejected the proposal outright. Calling the negotiations “absurd, humiliating and insulting,” Kassem said any requirement for Hezbollah fighters to leave southern Lebanon while under attack would amount to “surrender, defeat and achieving the enemy’s goals.” Hezbollah’s formal position, communicated to President Aoun, was that it would not accept any ceasefire that did not begin with the withdrawal of Israeli forces from Lebanese territory.
Iranian Revolutionary Guard Corps Commander Esmail Qaani aligned with Hezbollah’s stance, stating that Israel must first withdraw to pre-war positions before any ceasefire could begin. Israeli Defense Minister Israel Katz meanwhile demanded the demilitarized zone while explicitly reserving Israel’s right to continue attacking Hezbollah — and stated that Israel would not withdraw from southern Lebanon.
A Serbian peacekeeper killed — and the UNIFIL toll
The breakdown came against a backdrop of deteriorating conditions for UN peacekeepers on the ground. On June 3, a mortar struck a UNIFIL position near Marjayoun in southeastern Lebanon, killing one Serbian peacekeeper and wounding a Spanish and a Salvadoran peacekeeper. Neither side has acknowledged responsibility for the mortar fire.
The death brought the total number of UNIFIL fatalities since fighting escalated in March to seven — a toll that has drawn repeated condemnation from UN Secretary-General António Guterres and calls from troop-contributing nations for greater accountability. With roughly 10,000 peacekeepers deployed across southern Lebanon, the mission’s operating environment has grown sharply more dangerous since Israel resumed ground operations.
The wider context is tied to the same Iranian-backed network generating pressure across the region, explored in Iran suspending mediator contacts and striking Kuwait as a separate Hormuz deal stalled — a pattern of hardliners on multiple fronts scuttling diplomatic openings.
What comes next
With no ceasefire in place and Israeli operations continuing in southern Lebanon, the prospects for a near-term halt to fighting are limited. Washington has not publicly responded to Hezbollah’s rejection as of June 5. The demilitarized zone concept — which formed the core of the stalled agreement — has been the main framework for US-brokered discussions since November 2024, and its repeated failure to gain Hezbollah acceptance reflects the fundamental gap between what Israel requires and what Hezbollah is prepared to accept.