Iran has broken the terms of the historic nuclear agreement it signed in 2015 by exceeding the limit placed on the amount of nuclear fuel the country can stockpile.

Iranian state media reported the breach, which was widely anticipated after Tehran announced last week that it was ramping up its uranium enrichment. It was confirmed by the International Atomic Energy Agency, the UN’s nuclear watchdog.

Under the terms of the deal, from which President Trump withdrew in May last year, Iran was restricted to possessing 300kg of low-enriched uranium, far short of the amount it would need to produce enough weapons-grade uranium to fuel a nuclear bomb. The breach is the strongest sign yet that Iran no longer feels bound by the terms of