What you need to know about the preliminary U.S.-Iran agreement signed by Trump

What you need to know about the preliminary U.S.-Iran agreement signed by Trump June 19, 20266:30 AM ET Ruth Sherlock In this photo provided by the Islamic Republic News Agency (IRNA), Iranian President Masoud Pezeshkian displays a memorandum of understanding signed with U.S. President Trump aimed at ending the war and launching negotiations on a broader agreement, in Tehran, Iran, early Thursday. Iranian Presidency Office via AP hide caption toggle caption Iranian Presidency Office via AP Vice President JD Vance has delayed his trip to Switzerland to negotiate the terms of a peace agreement with Iran on Friday. It's unclear exactly why the talks were called off at the last minute, with hundreds of journalists already waiting in the alpine city of Lucerne. But the delay raises questions over the sturdiness of the memorandum of understanding to end the war, signed by Trump on Wednesday. It came as Israel continued to heavily bombard Lebanon, despite the agreement promising to end all military operations, including in Lebanon. Lebanese media said at least 18 were killed in overnight strikes, and Israeli said four of its soldiers had been killed in fighting in southern Lebanon. Sponsor Message Here are more details about the agreement and challenges they face in this latest effort to end the conflict: US lifts naval blockade There was immediate progress after the preliminary agreement to end the three-and-half month conflict that has killed thousands of people across the Middle East, rocked the global economy and pushed millions more into poverty around the world, according to the United Nations. The United States lifted its naval blockade on Iran. The short memorandum of understanding also promises to end military operations on all fronts and reopen the Strait of Hormuz, the crucial waterway through which much of the world's oil, gas and fertilizer must pass to reach global markets. The agreement prompted President Trump to celebrate on Truth Social writing: "Ships of...