Iran announces closure of the Strait of Hormuz amid rising tensions

On June 20, 2026, Iran's top joint military command announced the closure of the Strait of Hormuz to vessel traffic. Tehran cited alleged violations of a ceasefire memorandum of understanding by the United States and Israel, specifically pointing to ongoing Israeli airstrikes against Hezbollah positions in Lebanon. The Iranian military characterized this action as a first step and warned that further measures could be taken if aggression continues. While the military command announced the closure, prior reports indicated that Iran had previously offered a 60-day window of free passage for commercial ships. The situation remains volatile as planned diplomatic talks in Switzerland between Iran and the U.S. have been indefinitely postponed. Shipping monitors reported increased navigational anomalies and potential security risks, though the UK Maritime Trade Operations (UKMTO) had previously downgraded the threat level following earlier negotiations. There is no confirmation from U.S. or Israeli officials regarding the alleged breaches of the ceasefire agreement.