What is a naval blockade and how would it work in Strait of Hormuz?
What is a naval blockade and how would it work in Strait of Hormuz?
The US military has initiated a blockade of all maritime movement into and out of Iranian ports, effective Monday. This action allows vessels from other nations to traverse the Strait of Hormuz, a vital waterway that Iran has effectively controlled in response to US-Israeli strikes. The decision follows stalled talks between the two sides to end the conflict, which began on 28 February.
Trump’s Rationale for the Blockade
US President Donald Trump claimed that negotiations in Pakistan collapsed because Iran was “unwilling to give up its nuclear ambitions.” Iran’s foreign ministry countered, attributing the failure to “excessive demands and unlawful requests” from the US. In a Truth Social post, Trump announced the start of “BLOCKADING any and all Ships trying to enter, or leave, the Strait of Hormuz,” vowing to intercept vessels that paid “illegal tolls” to Iran.
“I have also instructed our Navy to seek and interdict every vessel in International Waters that has paid a toll to Iran. No one who pays an illegal toll will have safe passage on the high seas,” Trump stated.
Additionally, Trump revealed plans to destroy mines Iran has deployed in the strait, declaring that “Any Iranian who fires at us, or at peaceful vessels, will be BLOWN TO HELL!” He argued that Iran’s refusal to grant unimpeded access to the waterway—despite promising to do so—had prolonged the crisis.
Implementation Details
According to the US Central Command, the blockade will commence at 10:00 EDT (15:00 BST) on Monday. Forces will enforce it impartially, targeting vessels entering or exiting Iranian ports and coastal areas, including those in the Arabian Gulf and Gulf of Oman. Non-Iranian ships transiting through the strait will not be hindered, with commercial mariners to receive formal notice before the operation begins.
Trump hinted at international collaboration, though he did not specify which countries would join. The BBC reports the UK will not participate, with a government spokesperson emphasizing the need to “protect freedom of navigation” and ensure the strait remains open to support the global economy.
Legal Concerns and Strategic Implications
Three US legal experts raised questions about the blockade’s compliance with maritime law, noting that a belligerent operation to restrict neutral vessels could be contested. They also queried whether the move would breach the current ceasefire agreement. The strait’s narrow geography has long enabled Iran to wield it as leverage, limiting passage and inflating oil prices by charging hefty tolls to ships.
“The Strait of Hormuz must not be subject to tolling,” said the UK spokesperson, while stressing efforts with France and allies to form a coalition for maritime security.
By closing the strait, Trump aims to disrupt Iran’s revenue streams, though this could escalate tensions and risk unintended consequences. The US plans to deploy minesweepers, with the UK also expected to contribute, as part of a broader strategy to “clean out” the waterway and restore its free flow. The policy is described as an “all or none” approach, with Trump insisting an agreement on open passage will eventually be reached.
