Despite differences between diplomats and military officials, Iranian authorities have largely presented a united front toward the United States: They have refused to negotiate under pressure and have demanded prior guarantees, especially regarding the lifting of the blockade in the Strait of Hormuz.

With the ceasefire due to expire midweek, Pakistan has intensified diplomatic contacts with both Washington and Tehran.

Uncertainty looms over U.S.-Iran talks in Pakistan as both sides prepare amidst heightened security and unresolved diplomatic tensions.