Iran blocks the Strait of Hormuz: the fragile truce has collapsed
June 20, 2026. The Khatam al-Anbiya Central Command—Iran's highest joint headquarters—has officially announced the closure of the Strait of Hormuz to shipping. The reason cited is systematic violations of the Islamabad Memorandum by the United States and Israel.
This decision is a direct blow to hopes for de-escalation, which markets had so optimistically priced in just a few days ago. The closure of the strait, through which approximately 21 million barrels of oil and petroleum products pass daily (roughly 20% of global consumption and a quarter of all seaborne oil trade), once again pushes global energy transit to the brink of collapse.
Recall that the 14-point Islamabad Memorandum, agreed upon around June 17, 2026, stipulated that Iran would make maximum efforts to ensure safe and free passage for commercial vessels during the first 60 days. In response, the U.S. was to lift the naval blockade of Iranian ports. Ship traffic began to recover, leading to a temporary decline in energy prices. However, Tehran now claims that Israel's ongoing actions in Lebanon and violations by Washington nullify these agreements.
Escalation and Market Implications
The Iranian command describes the closure of the strait as a "first step" and warns of further measures if "aggression" continues. It is important to emphasize that there are virtually no alternative routes for Persian Gulf countries. Besides oil, major export shipments of liquefied natural gas from Qatar and the UAE pass through the strait. Any disruption in this region instantly amplifies price volatility, as the market had already priced in relief from the situation.
Significantly, U.S. Vice President JD Vance has already issued a rebuttal, stating the opposite—that the strait is not officially closed. However, the statements from Iranian military officials, amplified by all state media, speak for themselves. The market finds itself in a trap: the memorandum, which led to a drop in oil prices in just a few days, may now become a catalyst for a much more severe supply shock.
My analysis: The situation demonstrates how fragile any diplomatic agreements are in a region where each participant pursues its own interests. The closure of Hormuz is not merely a tactical move but a signal of Tehran's readiness to use its most powerful economic lever. Investors should prepare for a prolonged period of high volatility in commodity markets and, consequently, a reassessment of risks in cryptocurrencies, which are increasingly correlated with macroeconomic instability.