U.S. President Donald Trump declared that the American naval blockade of Iranian ports would not be relaxed until Tehran agrees to terms covering its atomic activities. His statement came as Iran reopened the Strait of Hormuz to commercial shipping on Friday, only to close it again Saturday and fire on a tanker attempting passage. Iran’s military said the waterway is now under full armed control and warned of strikes on any vessel that defies the closure, which it views as a response to the U.S. blockade. The strait carries roughly one-fifth of the world’s oil, so renewed restrictions risk worsening the global energy crunch and escalating tensions, though mediators still report progress toward an April 22 ceasefire deal between the two countries.