President Donald Trump said the United States will impose a naval blockade on the Strait of Hormuz after weekend peace talks with Iran collapsed, deepening fears of a prolonged regional conflict and further disruption to global energy supplies.
In a statement posted on his social media platform Truth Social, Trump said the U.S. Navy would begin blocking vessels attempting to enter or exit the strategic waterway, accusing Iran of “extortion” through its influence over one of the world’s most critical shipping lanes.
“Effective immediately, the United States Navy… will begin the process of BLOCKADING any and all ships trying to enter, or leave, the Strait of Hormuz,” Trump wrote, adding that the operation would involve allied countries.
The U.S. Central Command said late Sunday that implementation would begin at 10 a.m. ET on Monday, with additional guidance to be issued to commercial shipping operators.
Officials later clarified that the enforcement would be more limited than initially suggested, focusing on vessels linked to Iranian ports and coastal areas rather than all traffic through the strait. Ships transiting to and from non-Iranian ports would not be directly impeded, according to CENTCOM.
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Still, the announcement has sharply escalated tensions in an already volatile region, where nearly one-fifth of global oil shipments typically pass through the narrow waterway between Iran and Oman.
The move follows the breakdown of high-level negotiations hosted in Pakistan over Iran’s nuclear programme, regional security arrangements and demands related to the strategic strait.
The talks reportedly lasted more than 21 hours but ended without agreement, prompting immediate military and economic repercussions.
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Oil markets reacted strongly, with prices surging above $100 per barrel in recent trading sessions amid fears of prolonged supply disruption. Analysts warned that a full blockade could push prices significantly higher and trigger renewed global inflation pressures.
Trump defended the decision, arguing that it was necessary to prevent Iran from exerting control over the waterway and benefiting economically during the ongoing conflict.
“This is world extortion, and leaders of countries… will never be extorted,” he said in remarks on Fox News, adding that the operation would continue until Iran changed its position.
He also warned that any vessel paying fees or “tolls” to Iran would be targeted by U.S. naval forces operating in international waters, expanding the scope of enforcement beyond the strait itself.
The announcement has raised questions over legal authority and potential escalation risks, with maritime law experts noting that restrictions on transit through international straits are highly contentious under global law.
Iran responded sharply, warning that it would consider any military presence near the strait a violation of the ceasefire and would respond accordingly. Iranian Revolutionary Guard officials said the waterway would remain open only for regulated civilian passage.
Tehran has also accused Washington of attempting to destabilise negotiations and provoke further confrontation, while warning that global economies would bear the consequences of higher energy prices.
The U.S. administration signalled that additional measures could follow. Trump said he was considering renewed strikes on Iranian infrastructure, including energy and utility facilities, if diplomacy remained stalled.
Officials also indicated that countries assisting Iran could face secondary penalties, including a proposed 50% tariff on Chinese entities if Beijing is found to be supporting Tehran’s defence capabilities.
The White House said allied support for the operation was expected, though details remained unclear. Trump suggested that the United Kingdom and Gulf partners would assist with mine-clearing operations and maritime security, although London later indicated it would not participate in enforcement actions.
The developing crisis has further strained global shipping routes already disrupted by months of instability in the Persian Gulf. Tanker traffic through the Strait of Hormuz had only recently begun to recover after earlier disruptions linked to the conflict.
Energy analysts warn that a sustained blockade or enforcement campaign could trigger one of the most severe supply shocks in decades, given the strait’s role as a key transit point for crude oil, liquefied natural gas and petrochemical exports from Gulf producers.
Beyond energy markets, economists say the confrontation risks broader global spillovers, including inflationary pressure, trade disruption and potential retaliation from affected countries.
With diplomatic talks stalled and military posturing escalating, the Strait of Hormuz has once again become the focal point of a rapidly widening geopolitical crisis with far-reaching economic consequences.
