…Accuses U.S., Israel of breaching ceasefire deal
SAT JUNE 20 2026-theGBJournal| Global oil markets were thrust back into turmoil on Saturday after Iran’s top military command announced the closure of the Strait of Hormuz to all vessels, citing what it called U.S. failure to honor commitments under a recently announced war-ending memorandum and continued Israeli military operations in southern Lebanon.
The declaration, issued by Iran’s Khatam al-Anbiyaa Central Headquarters, marks a sharp escalation only days after U.S. President Donald Trump unveiled a framework agreement aimed at easing regional tensions and restoring maritime traffic through the world’s most critical energy chokepoint.
The announcement immediately revived concerns over disruptions to global crude supplies, with traders reassessing geopolitical risk premiums amid conflicting reports over whether shipping through the waterway has actually been halted.
Iran’s military command said the closure was a direct response to Washington’s alleged failure to implement provisions of the memorandum intended to end hostilities and to what Tehran described as persistent Israeli ceasefire violations in southern Lebanon.
The statement warned that the move represented only a “first step” and that additional measures could follow if what it termed aggression continued.
The latest threat underscores the fragility of the diplomatic arrangement announced earlier by Trump, who had presented the agreement as a breakthrough that would reopen the Strait of Hormuz and reduce pressure on global energy markets.
Iran’s Supreme Leader, Mojtaba Khamenei,
had previously signaled reservations about the deal, saying he held a different view “in principle” but authorized it based on assurances from the Iranian president and senior officials that the rights of the Iranian nation would be protected.
Energy markets reacted nervously because the Strait of Hormuz remains the world’s most important oil transit corridor, handling roughly one-fifth of global crude and liquefied natural gas flows under normal conditions.
Any sustained disruption could tighten supplies from major Gulf exporters including Saudi Arabia, Iraq, Kuwait, the United Arab Emirates and Qatar, potentially reigniting inflation concerns across major economies.
However, uncertainty remains over the practical impact of Iran’s announcement.
U.S. officials have said there is no immediate evidence of military activity indicating a fresh blockade, while Vice President JD Vance stated that oil shipments were continuing through the waterway and that millions of barrels had transited the route in the previous 24 hours.
The conflicting claims have added to volatility in crude markets, where traders are weighing the risk of supply disruptions against questions over Iran’s ability or willingness to fully enforce a closure.
Brent crude had recently retreated following optimism surrounding the U.S.-Iran framework agreement, but analysts say any credible threat to Hormuz traffic could rapidly reverse that decline.
Previous closure announcements by Tehran this year triggered sharp oil rallies, with Brent briefly approaching $95 a barrel as investors priced in the possibility of a major supply shock.
The renewed standoff now places oil markets at the center of a widening geopolitical confrontation, with investors closely monitoring whether diplomatic efforts can prevent further escalation in a region that remains critical to global energy security.
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