Iran blocks the Strait of Hormuz: Fragile ceasefire collapses, oil markets in shock
June 20, 2026. The Khatam al-Anbiya Central Command—Iran's highest joint headquarters—officially announced the closure of the Strait of Hormuz to shipping. The reason cited was "violations of the Islamabad Memorandum" by the United States and Israel. This decision instantly shattered hopes for de-escalation that markets had priced in just days earlier.
The Strait of Hormuz is the artery of global energy. Approximately 21 million barrels of oil and petroleum products pass through it daily, accounting for about 20% of global consumption and a quarter of all seaborne oil trade. According to the U.S. Energy Information Administration, blocking this route is not just a local conflict but a direct blow to global supply chains.
The Islamabad Memorandum: An Agreement That Lasted Less Than a Week
Just three days ago, on June 17, the 14-point Islamabad Memorandum was agreed upon. The document stipulated that Iran would make maximum efforts to ensure the safe and free passage of commercial vessels for the first 60 days. In return, the U.S. was to lift the naval blockade of Iranian ports. Markets immediately responded with a drop in oil prices—it seemed the crisis was over.
However, today's statement by the Iranian military nullifies all progress. Tehran views Israel's ongoing actions in Lebanon and "aggression" from Washington as a direct violation of the memorandum's terms. This is the first step, and as the command warns, further measures will follow if the "aggression" continues.
Market Reaction and Mixed Signals
Notably, there has been no official confirmation of the strait's closure from the U.S. side. Vice President JD Vance, in a recent statement, indicated the opposite, speaking of a long-term strategy to neutralize Iran's nuclear ambitions. This creates a classic information warfare scenario, where actual actions may diverge from official statements.
My expert assessment: The market has fallen into a trap of its own expectations. Investors rushed to price in a "peace scenario," but geopolitical reality once again demonstrates its unpredictability. The closure of the Strait of Hormuz—even if temporary—will trigger a sharp spike in volatility across commodity markets. Alternative routes for Gulf countries are virtually nonexistent, meaning any disruption in transit will immediately impact energy prices. In the coming days, we are likely to see not only a rise in oil prices but also a capital shift into safe-haven assets, including Bitcoin, which traditionally reacts to such macroeconomic shocks.