Israel's military leadership ordered forces to prepare for a potential renewal of hostilities with Iran on Sunday, following the collapse of US-Iran diplomatic negotiations.

IDF Chief of Staff Lt. Gen. Eyal Zamir directed all units to enter a heightened state of readiness and initiate combat procedures, according to Israeli media citing defense sources and military reports aired by Al Jazeera. The move came as talks in Islamabad between US negotiators, led by Vice President JD Vance with Jared Kushner and Steve Witkoff, and Iran's delegation under Parliament Speaker Mohammad Bagher Ghalibaf ended without agreement after more than 21 hours.

The discussions failed primarily over Iran's insistence on its nuclear rights and control of the Strait of Hormuz, with Vance describing the US offer as final and Iran's stance as unyielding. US President Donald Trump confirmed the breakdown, stating Iran refused to abandon nuclear ambitions, and declared a US Navy blockade of the strait effective immediately, vowing "Iran will never have a nuclear weapon."

The order reflects concerns over a possible Iranian miscalculation sparking renewed fire, as Israel maintains operations against Hezbollah in southern Lebanon despite the truce. Hezbollah fired about 20 rockets at northern Israel today, all intercepted or landing in open areas with no casualties. Israeli strikes in Lebanon killed at least 11 people earlier, contributing to over 2,000 deaths there since March.

The conflict began on February 28, 2026, when the United States and Israel launched airstrikes on Iranian military, nuclear, and government targets under Operation Epic Fury, assassinating Supreme Leader Ali Khamenei and other leaders. Iran responded with missile and drone attacks on Israel and US bases across the Gulf, closing the Strait of Hormuz and causing global oil disruptions.

Over six weeks, strikes expanded to proxies like Hezbollah and Houthis, damaging infrastructure from Tehran to Gulf energy sites. Casualties include over 7,650 killed in Iran, 15 US troops, 40 in Israel, and thousands injured regionally. A two-week ceasefire took effect on April 8, brokered by Pakistan on Iran's 10-point plan, with Iran agreeing to reopen the strait, but it excluded Lebanon and now hangs in the balance.

The war has cost Israel about NIS 35 billion ($11.5 billion) in defense and related expenses, per the Finance Ministry. Iran's IRGC Navy warned a US destroyer away from the strait today, heightening tensions as the US clears mines and enforces passage.