Uncertainty over a second round of US-Iran talks in Islamabad has persisted over the past few days as the fragile truce between the two countries nears its end. While a US delegation — headed by US Vice President JD Vance — is expected in Islamabad for negotiations, the Iranian side has not yet confirmed its participation in the high-stakes talks. US President Donald Trump, on the other hand, has ramped up his threats against Iran, stating that it could “face problems” if it did not return to the negotiating table. Iran’s top leadership has maintained that it will not negotiate “under the shadow of threats”. The latest tension also follows the US seizure of an Iranian-flagged ship in the Strait of Hormuz, while a US blockade of Iranian ports has been in place since April 13 , prompting Tehran to close the strait again on Saturday. Here are the main sticking points that are expected to be the centre of closed-door discussions, if the two parties meet at the negotiating table ag...