Escalation in the Strait of Hormuz: Iran announces closure, ceasefire at risk of collapse
On 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 recently agreed Islamabad Memorandum by the United States and Israel. This decision overnight overturns the fragile truce and returns geopolitical risks to the epicenter of global energy markets.
This move directly contradicts market expectations, which just a few days ago had priced in a de-escalation of the conflict. The closure of the Strait of Hormuz is not just a political demonstration but a direct threat to global energy supply chains.
Military Command Statement and Context
The Central Command called the closure of the strait a "first step" and warned of harsher measures if aggression continues. The information was immediately disseminated by all Iranian state media. This conflict is a continuation of a series of strikes by the US and Israel in late February 2026, which led to the imposition of previous restrictions on passage through the strait.
Approximately 21 million barrels of oil and petroleum products are transported daily through the Strait of Hormuz, accounting for about 20% of global liquid hydrocarbon consumption and roughly a quarter of all seaborne oil trade, according to the US Energy Information Administration (EIA). In addition to oil, major export shipments of liquefied natural gas from Qatar and the UAE pass through the strait. Any disruptions in this region have historically led to sharp price volatility, as alternative routes for Gulf countries are virtually nonexistent.
The Islamabad Memorandum: A Deal That Didn't Work
The 14-point Islamabad Memorandum, agreed upon around June 17, 2026, stipulated that Iran would make maximum efforts to ensure the safe and free passage of commercial vessels for the first 60 days. The plan also called for the US to lift its naval blockade of Iranian ports. Ship traffic began to recover after this agreement was reached, contributing to a decline in energy prices.
The new statement from the Iranian army effectively nullifies this agreement. Tehran views Israel's ongoing actions in Lebanon as a direct violation of the memorandum. Previously, this deal quickly led to lower oil prices, but the current situation once again focuses market attention on the risks of a long-term supply shock.
However, it is worth noting that the official closure of the strait has not yet been confirmed in practice. US Vice President JD Vance has already indicated the opposite, stating a long-term strategy to neutralize Iran's nuclear ambitions. Nevertheless, the very fact of such a statement from Tehran is a powerful signal to the market of a willingness to go all the way.
My expert opinion: The oil market is entering a phase of maximum uncertainty. Even if the closure of the strait is temporary and demonstrative in nature, the mere threat of blocking a key transport hub will immediately pressure prices. Investors in commodity assets and cryptocurrencies sensitive to macroeconomic shocks should prepare for increased volatility and a reassessment of risk premiums in the coming days.