US President Donald Trump said the US Navy would swiftly begin a blockade of ships entering or leaving the Strait of Hormuz, after US-Iran ceasefire talks in Pakistan ended without an agreement.US Central Command announced that it will blockade all Iranian ports beginning Monday at 10 a.m. EDT, or 5:30 p.m. in Iran.The US and Iran ended 21 hours of face-to-face talks in Islamabad without reaching a deal, leaving the fate of the fragile, two-week ceasefire still unclear.The war that has killed thousands of people and shaken global markets has entered its seventh week.