Why Iran's Ceasefire Is Already on the Verge of Collapse

TEHRAN – The ceasefire announced on April 8 between Iran, the United States, and Israel was fragile from the start. Just days later, it is hanging by a thread, and Lebanon has become the unexpected flashpoint threatening to tear it apart.

Iran's President Masoud Pezeshkian has made his position clear. He does not trust the United States, citing its long "track record of betraying diplomacy." While Iran has put forward a "10-point peace plan" and talks are set to continue in Islamabad, the foundation of the truce is built on deep suspicion.

Almost immediately after the ceasefire was declared, Iran accused Israel of violating the agreement by launching attacks on Lebanon. Iranian state media has warned that these strikes could lead to the complete collapse of the truce. In Tehran's view, military action in Lebanon is not a separate issue. It is a direct threat to the ceasefire itself. President Pezeshkian explicitly stated that halting Israeli strikes on Lebanon was one of Iran's "pivotal conditions" for the ceasefire.

The problem is that Israel disagrees. Prime Minister Benjamin Netanyahu has declared that the ceasefire "does not include Lebanon" and that Israel will continue its operations against Hezbollah . This fundamental disagreement—Tehran saying Lebanon is included, Jerusalem saying it is not—has turned the truce into a ticking time bomb.

This dispute has serious consequences. Iran had planned to partially reopen the strategic Strait of Hormuz—a waterway carrying one-fifth of the world's oil—as a sign of good faith. But after Israeli attacks on Lebanon continued, Iran closed the strait again. Iranian officials now warn that if Israeli attacks on Lebanon persist, the strait will remain shut, sending global energy prices soaring .

Iran's Foreign Minister Abbas Araghchi has put the ball squarely in Washington's court. "The world sees the massacres in Lebanon," he wrote on X. "The US must choose—ceasefire or continued war via Israel. It cannot have both" .

The ceasefire is not stable. It is conditional. And the condition is Lebanon. If fighting continues there, Iran has signaled it will walk away from the truce, keep the strait closed, and plunge the region back into open conflict.

SOURCES AND REFERENCES:

The Guardian (April 8, 2026): "Israel says ceasefire does not include Lebanon"

The Guardian (April 8, 2026): "Iran closes Strait of Hormuz in response to Israeli attacks on Lebanon"

The Guardian (April 8, 2026): "Ceasefire must include Lebanon or war will continue, Iran's foreign minister says"

BBC World Service (April 8, 2026): "The US, Israel and Iran announce two-week ceasefire"

Arab News (April 8, 2026): "Israel continues strikes on southern Lebanon as Netanyahu says Iran truce does not include Lebanon"