Iran closes the Strait of Hormuz: fragile truce collapses, markets in shock
June 20, 2026. The Khatam al-Anbiya Central Command — Iran's highest joint headquarters — announced the blockade of the Strait of Hormuz for shipping. The official reason is a violation of the Islamabad memorandum by the United States and Israel. This decision not only nullifies recent diplomatic efforts toward de-escalation but also plunges global energy markets back into a sea of uncertainty.
This move is a direct response to what Tehran views as ongoing aggressive actions by Washington and Tel Aviv, which are alleged to have violated the terms of the recently agreed-upon 14-point memorandum. The Iranian command describes the closure of the strait as a "first step" and warns of harsher measures if the "aggression" continues.
The world's energy artery under threat
It is worth recalling that approximately 21 million barrels of oil and petroleum products are transported through the Strait of Hormuz daily, accounting for about 20% of global liquid hydrocarbon consumption and a quarter of all seaborne oil trade. This is a key transit hub for Persian Gulf countries, and there are essentially no alternative export routes. Any blockade here immediately translates into price increases and volatility in global markets.
Just three days ago, on June 17, the Islamabad memorandum was agreed upon, stipulating that Iran would make maximum efforts to ensure safe and free passage for commercial vessels during the first 60 days. In return, the United States was to lift the naval blockade of Iranian ports. This document gave markets hope for stabilization, and oil prices began to decline. However, the current statement from the Iranian military completely dashes these expectations.
The situation is exacerbated by the fact that the conflict in the Middle East, which began after U.S. and Israeli strikes in late February 2026, shows no signs of abating. Tehran views Israel's ongoing actions in Lebanon as a direct violation of the ceasefire terms.
Markets bracing for a supply shock
While there is no official confirmation of a full blockade from independent sources — U.S. Vice President JD Vance has already indicated the opposite — the mere statement from Iran's highest military command is a powerful signal for traders and investors. Markets, which had already priced in relief from geopolitical tensions, are now forced to revise scenarios toward a long-term supply shock.
My expert assessment: This is not just an escalation; it is Tehran demonstrating its ability to instantly change the rules of the game. Even if the blockade is not 100% implemented, the geopolitical risk premium in oil prices will now persist for a long time. For the cryptocurrency market, this means a resumption of correlation with oil and increased macroeconomic uncertainty, which traditionally weighs on risky assets. Investors should prepare for a period of heightened volatility and seek safe-haven assets.