Iran announces closure of the Strait of Hormuz: fragile truce collapses, markets in shock
On June 20, 2026, the Joint Operational Command of Iran, "Khatam al-Anbiya," issued a statement that instantly shook global energy markets: the Strait of Hormuz is closed to shipping. As an official pretext, Tehran cited violations of a recently signed memorandum between the United States and Israel, concluded in Islamabad.
This decision is a direct blow to the fragile attempts at de-escalation that markets had begun to price in. Just a few days earlier, the situation seemed to be stabilizing, and traders were hoping for a reduction in geopolitical risks. Now, we are witnessing a sharp reversal.
Military Command Statement: Ultimatum and Threats
The "Khatam al-Anbiya" headquarters, Iran's highest operational command body, called the blockade of the strait a "first step" and threatened new, harsher measures if pressure on the country does not cease. The decision was announced through state media and followed several months of conflict that began in late February 2026 after strikes by the United States and Israel. Notably, restrictions on access to the strait had been imposed earlier, but a complete closure is an unprecedented step.
Approximately 21 million barrels of oil and petroleum products pass through the Strait of Hormuz daily. According to the U.S. Energy Information Administration, this accounts for about 20% of global petroleum consumption and nearly a quarter of all seaborne oil. Additionally, key shipments of liquefied natural gas from Qatar and the UAE pass through here. Producers in the Persian Gulf have virtually no alternative routes, making this region a critical point of vulnerability for the entire global economy.
Conflict Over the Islamabad Memorandum
The 14-point memorandum, agreed upon around June 17, 2026, included commitments from Iran to ensure safe and free passage of vessels for 60 days. The document also required the United States to lift the naval blockade of Iranian ports. After its conclusion, shipping began to recover, and energy prices fell, giving markets a respite.
The new military statement completely nullifies these agreements. Tehran interprets Israel's actions in Lebanon as further violations, rendering the memorandum essentially stillborn. Interestingly, the fact of the strait's closure has not yet been independently confirmed. U.S. Vice President JD Vance has already issued a denial, stating that there is no evidence of a blockade.
Analytical Commentary: Even if Iran's statement is currently just rhetoric and a bargaining chip, the very fact of such a démarche destroys trust in any negotiation processes. Markets can no longer ignore the risk of long-term supply disruptions. We are entering a phase where the geopolitical premium in oil prices may become entrenched at a new, higher level, and volatility will become the new norm.