JD Vance says talks failed due to Iran’s refusal to give up nuclear programme

Iranian sources, however, blame excessive' demands from Washington for breakdown of talks in Islamabad to resolve US-Iran conflict

• Middle East crisis - live

The US vice-president, JD Vance, has blamed the failure of marathon negotiations with Iran on the country's refusal to abandon its nuclear weapons programme, while Iranian sources have hit back at excessive" demands from Washington.

Vance, who left Islamabad on Sunday morning after 21 hours of talks with Iranian officials in the Pakistani capital, said his team had been very clear on its red lines, as hopes faded of a quick end to the conflict that began on 28 February.