There was uncertainty about whether a cease-fire would hold and the two sides could reach a long-term deal. Vice President JD Vance struck an optimistic but cautious tone before he left for the talks.

Negotiators for the U.S. and Iran are set to gather this weekend in Pakistan's capital for peace talks. But the fragile 2-week ceasefire is at risk if both sides can't agree amid Israel's ongoing conflict with the Iranian proxy group Hezbollah in Lebanon.

Mohammad Bagher Ghalibaf and Foreign Minister Abbas Araghchi arrived in Pakistan’s capital for negotiations with the United States, Iranian state media reported on Friday. The announcement came hours after Mr.

Some hardline factions in Tehran want to continue the war. Others see the Islamabad meeting as an opportunity to refashion relations with Washington.

Trump: Iran war 'going well' ahead of peace talks. 00:00:53, play videoTrump: Iran war 'going well' ahead of peace talks 0:21Vance: Trump gave 'clear guidelines' for Iran negotiations. 00:00:21, play videoVance: Trump gave 'clear guidelines' for Iran negotiations 0:26Israeli strikes hit city in southern Lebanon.

Nineteen vessels have sailed through the Strait of Hormuz since the beginning of the ceasefire on Tuesday evening, according to data from the ship-tracking website MarineTraffic analyzed by NBC News.

Trump has said "all U.S. ships, aircraft and military personnel" will remain in place until Iran fully complies.

Alex Shams, editor-in-chief of the AJAM Media Collection, has family in Iran and spoke with CBS News about their reactions to the fragile ceasefire currently in place with the U.S.