In Pakistan’s capital, the army has been deployed, a public holiday has been declared and the streets are eerily empty

• Middle East crisis – live updates

The streets of Islamabad were on strict lockdown as Pakistan’s capital prepared to play host to historic negotiations between Iran and the US that have dangled the promise of an end to war that has devastated the Middle East.

Even as the US-Iran ceasefire looked increasingly precarious, amid Israel’s continued bombardment of Lebanon and disputes over the terms of the talks, Pakistani officials insisted that the make-or-break peace negotiations would be going ahead over the weekend as planned.

Analysts say Pakistani officials’ efforts led to breakthrough that has helped avert catastrophe, at least for now

• Middle East crisis – live updates

Pakistan’s leaders had almost lost hope. After more than two weeks of frantic negotiations, phonecalls and diplomatic summits to try to end the US-Israeli war with Iran, it looked like the conflict might instead be escalating into Islamabad’s worst nightmare.

In a cabinet meeting held at about 5pm on Tuesday, Pakistan’s prime minister, Shehbaz Sharif, was morose. “We should brace ourselves for the impact of the war,” he told his cabinet ministers. “The situation has really become very bleak. The chance of peace has become dim.”