Secretary of State Marco Rubio is leading the ambassador-level negotiations, but it remains unclear whether the administration will push for a permanent resolution.

Tehran put limits on the Strait of Hormuz’s opening, as the United States issued a new sanctions exemption on the sale of Russian oil.

The lead U.S. negotiator, Vice President JD Vance, has sought a moratorium on uranium enrichment of at least 20 years. Tehran’s offer would last up to five.

Amid allegations of bad faith and ceasefire violations from both Washington and Tehran, negotiators arrived in Islamabad for high-stakes talks.

The president said he had received a 10-point proposal from Iran that formed a “workable basis” for negotiations. But Israel said the ceasefire “does not include Lebanon.”

The president has given Iranian officials until 8 p.m. Tuesday to make a ceasefire deal or face widespread destruction. Tehran on Monday reasserted its rejection of U.S. demands.

A plan briefed to Trump last week to insert ground forces to remove Iran’s nuclear material would be a very difficult endeavor of a type never before attempted in wartime.

Iran contradicted Trump’s claims that direct talks with more a moderate regime in Tehran were making “great progress.”

The administration had threatened to punish countries that attempted to break the blockade, which was aimed at weakening the communist government.

The strike on Prince Sultan Air Base also damaged at least two Air Force refueling aircraft and underscored that despite weeks of strikes, Iran still poses a threat.