Iran has completely closed the Strait of Hormuz to all shipping after the Islamic Revolutionary Guard Corps (IRGC) struck and stopped a civilian vessel that allegedly ignored course changes. The IRGC declared the blockade will remain until US “interference” ceases and warned that US regional bases could be targeted if Washington retaliates. The escalation follows Washington’s ultimatum for maritime security and its demand that Tehran surrender its entire 410-kilogram stockpile of enriched…