Iran said the United States violated a ceasefire after the U.S. conducted what it called defensive strikes in southern Iran, while U.S. Secretary of State Marco Rubio said negotiating a deal to halt the conflict could "take a few days.

The attacks in southern Iran prompted Tehran to warn that it would "leave no act of hostility unanswered," complicating negotiations to end the war.

The fresh strikes from the U.S., and the warning Iran issued in return, have brought renewed instability to the markets.

The fragile ceasefire between the United States and the Islamic Republic of Iran suffered its most severe breakdown to date overnight, as both nations traded direct military strikes across the Persian Gulf.

WASHINGTON — Secretary of State Marco Rubio vowed Tuesday that the Strait of Hormuz will open “one way or the other” after US forces struck targets across southern Iran overnight as Washington and Tehran scramble to iron out language in a framework peace deal.

Former Dep. Director of National Intelligence Beth Sanner joins CNN’s Brianna Keiler to discuss the latest U.S. strike in Iran and what it means for the fragile ceasefire.

US forces hit Iranian military sites following a high-stakes Cabinet session focused on regional conflict and economic strain.

Kuwait intercepted missiles launched by Iran late on Wednesday night, the US military has said, describing the attack as an "egregious ceasefire violation". In a post on X, US Central Command said Iran had launched a ballistic missile toward Kuwait - one of America's top allies in the Persian Gulf - but it was successfully intercepted.