U.S. and Iran Sign Ceasefire to End 110-Day War as Lebanon Flare-Up Tests Fragile Truce

After 110 days of devastating asymmetric warfare, the United States and Iran have signed a 14-point memorandum of understanding to end the conflict known as Operation Epic Fury. The agreement, finalized remotely by U.S. President Donald Trump and Iranian President Masoud Pezeshkian, halts military operations across all fronts and initiates a fragile 60-day window to negotiate a permanent settlement.[2][4]

But the ink was barely dry before the truce faced a severe stress test. A deadly flare-up in southern Lebanon overnight on Thursday threatened to collapse the entire framework. Hezbollah ambushed an Israeli tank, killing four soldiers, prompting Israel to launch its deadliest strikes since the U.S.-Iran deal was announced, killing at least 18 Lebanese civilians.[1][3]

The violence forced U.S. and Iranian officials to abruptly postpone implementation talks scheduled for Friday in Switzerland, with U.S. Vice President JD Vance delaying his trip. The crisis was only defused after Trump personally intervened, urging Israeli officials to accept a ceasefire with the Iranian-backed militant group, which took effect late Friday afternoon.[1][2][3]

The "Islamabad Memorandum," brokered heavily by Pakistan and Qatar, mandates an immediate end to the U.S. naval blockade of Iranian ports and requires Tehran to reopen the Strait of Hormuz to commercial shipping. Crucially, the text explicitly includes Lebanon in the cessation of hostilities, effectively requiring Iran to rein in Hezbollah while demanding Israel halt its cross-border offensive.[4][8]

However, the memorandum defers the most intractable disputes to a 60-day negotiation period. Core issues—such as the permanent termination of U.S. primary and secondary sanctions and the exact constraints on Iran's future nuclear capacity—remain unresolved, leaving the global economy bracing for potential renewed volatility if talks fail.[4][6]

On the nuclear front, Washington made a significant concession. Rather than forcing Iran to surrender its 440-kilogram stockpile of highly enriched uranium, the agreement permits Tehran to down-blend the material domestically under the supervision of the International Atomic Energy Agency. Critics note this is nearly identical to terms Iran offered before the war began.[4][6]

In Israel, the agreement has triggered a political meltdown. Officials across the spectrum are furious, characterizing the deal as a strategic surrender that leaves Iran's nuclear infrastructure intact and abandons Israel's security imperatives. Prominent figures have accused the U.S. administration of throwing the Jewish state "under the bus."[5][7]

Israeli Prime Minister Benjamin Netanyahu appears increasingly isolated. Reports indicate he was sidelined during the final negotiations, learning of the memorandum's damning clauses from the press. While Netanyahu vowed that Israel would maintain its security buffer in southern Lebanon "for as long as required," the U.S.-Iran framework fundamentally undermines Israel's campaign to permanently dismantle Hezbollah's presence.[1][4][5]

In Tehran, the newly assembled leadership is navigating its own domestic tightrope. Following the death of Ali Khamenei in the war's opening airstrikes, the new Supreme Leader, Mojtaba Khamenei, issued a letter endorsing the deal in principle to rescue the battered economy. However, he explicitly deferred responsibility to President Pezeshkian, insulating himself from blame if the U.S. reneges on its commitments.[2]

Legal observers caution that the memorandum rests on shaky institutional ground. Because it is an executive understanding rather than a formal treaty requiring U.S. Senate ratification, its durability relies entirely on "good faith" and a prospective, binding resolution from the United Nations Security Council.[6]

The inclusion of Lebanon in a bilateral pact between Washington and Tehran has also laid bare the structural reality of the Levant. Lebanon's fate is being dictated by foreign powers, highlighting a chronic sovereignty deficit where local factions rely on external patrons who negotiate ceasefires over Lebanese territory.[8]

As the guns temporarily fall silent, the strategic math of the 110-day war is coming under intense scrutiny. The conflict drained tens of billions from the Pentagon, fractured the U.S.-Israeli alliance, and inflicted heavy civilian tolls, only to arrive at a diplomatic framework that leaves the region's underlying power dynamics largely unchanged.[4][5]

All eyes now turn to the delayed negotiations in Switzerland. With the Lebanon border tentatively quieted, American and Iranian diplomats have exactly two months to transform a precarious ceasefire into a comprehensive peace settlement—or risk plunging the Middle East back into a catastrophic regional war.[1][3]