Live updates: Iran walks away from talks, Tasnim says

Despite the latest U.S. strikes in Iran, talks toward an initial agreement to end the war continued in Doha on Tuesday, with a high-level Iranian delegation and Qatari mediators meeting in the city and the Trump administration's negotiators participating from afar, according to two U.S. officials.

Officials and mediators say that Iran and the U.S. are working to reach an agreement on an initial memorandum of understanding that would end the conflict and gradually reopen the Strait of Hormuz while nuclear issues were negotiated.

Although the memo would allow for nuclear negotiations to take place over at least 60 days, the Trump administration still wants to see Iran agree to some big-picture commitments before signing onto the framework, U.S. officials say.

Iran, meanwhile, continues to try to maximize economic incentives to be included in the initial phase of the agreement -- including pushing for the release of frozen Iranian assets, the U.S. officials added.

Another factor is the situation in Lebanon. Iran -- which has insisted Israel's fight against Hezbollah was part of the initial ceasefire deal -- is adamant that the memo should end the conflict there. However, the Trump administration has so far indicated it will continue to back Israel's right to defend itself from Hezbollah.

The internet blackout in Iran has been partially lifted after 87 days of a nationwide blackout.

"Following the mission of the esteemed President and in line with the government's promise, the first step towards free and regulated access to cyberspace has been taken," Mohammad Reza Aref, the first vice president of Iran, said in a statement Tuesday.

Adding, "With the reopening of the internet, smart services will be facilitated, the demands of the people who stood by the system and Iran will be met, and the obstacles to knowledge-based development and scientific authority will be removed."

U.S. forces on Monday launched what U.S. Central Command described as "self-defense strikes" in southern Iran.

"U.S. forces conducted self-defense strikes in southern Iran today to protect our troops from threats posed by Iranian forces," CENTCOM spokesperson Capt. Tim Hawkins said in a statement. "Targets included missile launch sites and Iranian boats attempting to emplace mines. U.S. Central Command continues to defend our forces while using restraint during the ongoing ceasefire."

President Donald Trump honored the 13 service members killed during the war in Iran while delivering Memorial Day remarks at Arlington National Cemetery.

"In Operation Epic Fury, we lost 13 wonderful souls, wonderful special people," he said. "These incredible men and women gave their lives to ensure that the world's number one state sponsor of terror will never have a nuclear weapon. Oh, and they won't. They will never have a nuclear weapon."

Seven service members died following the opening wave of Iranian retaliatory attacks across the Middle East, and six Air Force airmen were killed when a U.S. KC-135 refueling aircraft crashed in western Iraq.