Iran's seizure of two cargo vessels in the Strait of Hormuz on Wednesday has cast doubt on plans for a second round of talks in Pakistan's capital.
Islamabad aims to continue playing the role of an unexpected peace broker in the conflict between Washington and Tehran. Many in Islamabad are proud of the country's role in navigating a possible end to the fighting.
However, analysts say that a series of escalations by the US is complicating those efforts.