The US-Iran talks in Islamabad have 'failed' after 21 hours of continuous negotiations, with both sides unable to reach an agreement.
Iranian state media blamed the breakdown on what it described as 'unreasonable' and 'excessive' demands by the US.
Key sticking points included the Strait of Hormuz, nuclear rights, and other contentious issues.
The US Vice President said that he and his team were leaving Pakistan without reaching an agreement, leaving scope for Iranians to accept the 'best and final offer' from the US.
