Iran Says US Broke a Deal. It's Now Closing a Critical Shipping Lane

Iran's military announced June 20 that the Strait of Hormuz—a narrow waterway through which much of the world's oil passes—is closed. This is the second such announcement in ten days. Tehran frames this not as a blockade but as enforcement of a deal it says the US violated. The gap between the two announcements suggests behind-the-scenes negotiations failed. What happens next depends on whether other countries believe Iran's account.