Iran announced on the 21st that it has blockaded the entrance and exit channels of the Strait of Hormuz after the United States violated the ceasefire agreement, and that all navigation is under the strict control of the Iranian Islamic Revolutionary Guard Corps (IRGC) Navy. Iran emphasized that no ships will be allowed to pass through the strait, and the passage of warships is also prohibited, until it receives assurance that the naval blockade against Iran is fully lifted.