The sudden US-Iran ceasefire agreement has plunged Benjamin Netanyahu into a political nightmare, upending the strategic calculus that drove him to align with Donald Trump’s war against Tehran. Netanyahu had wagered that a joint military campaign would cripple Iran’s clerical regime, dismantle its network of regional proxies, and bolster his own standing ahead of Israeli elections. Instead, Trump is now racing to extricate himself from the conflict, leaving Israel’s objectives unmet and its forces still tied down in Lebanon. The result is an increasingly awkward rift between the two leaders, with the Israeli prime minister forced to confront a peace he never sought.

Viewed from Washington, the shift reflects Trump’s instinct to claim a diplomatic victory and shed a costly Middle Eastern entanglement. From Tehran, the ceasefire offers a chance to emerge from the war with its nuclear ambitions intact and its regional influence—particularly through Hezbollah—arguably strengthened. In Jerusalem, officials have been publicly circumspect, wary of provoking an ally known for prickly responses to criticism. Yet in private, frustration is mounting: the ceasefire risks freezing the conflict before Israel can deliver a decisive blow to Iran’s most potent proxy force on its northern border.

The deal systematically demolishes the three cornerstones of Netanyahu’s political career. His carefully cultivated image as a Washington whisperer who could steer American policy has been shattered by the spectacle of being sidelined and publicly overruled by his most vital ally. The prime minister who made confronting Iran the centre-piece of Israel’s security doctrine now faces a settlement that leaves Tehran not vanquished but arguably more resilient. And his old, already tarnished brand as “Mr Security” cannot easily survive the demand—backed by both Washington and Tehran—that Israel halt its attacks on Hezbollah in Lebanon, trapping him in a fresh security dilemma just months before elections.

Analysts in London note that the ceasefire has exposed a fundamental asymmetry between the two leaders’ goals. Trump sought a quick, decisive projection of American power; Netanyahu needed a prolonged campaign to redraw the regional balance. As the US president pivots to peace, the Israeli prime minister is left to manage the political wreckage. The collision course is set: Netanyahu must either accept a deal that undermines his entire security narrative or risk a public breach with an unpredictable American patron. Either path threatens to accelerate his political decline, turning the war he championed into the very instrument of his undoing.