Starmer draws line under US plan to blockade Iran's ports

The UK has officially distanced itself from a planned US maritime blockade targeting Iranian ports, with Prime Minister Keir Starmer stating that Britain will not lend military or diplomatic support to the effort. The move follows the collapse of weekend negotiations meant to secure a ceasefire in the ongoing conflict with Iran, and has sparked a wave of international concern.

Speaking Sunday evening, Starmer emphasized the risks of further escalation. "While we stand with our allies in seeking peace and security, unilateral actions that endanger global trade and civilian lives are not the answer," he said. "The UK will not be part of a blockade that could deepen the crisis in the region."

The US military confirmed it will begin restricting all maritime traffic entering and exiting Iranian coastal waters starting Monday. The operation, which would effectively seal off key Iranian ports, is being framed by the Trump administration as a response to stalled diplomacy and continued regional threats. But the plan has drawn sharp criticism beyond the UK.

France, Spain, and Turkiye have all voiced opposition, warning the blockade could disrupt energy markets and provoke unintended consequences. China, a major importer of Middle Eastern oil, condemned the move as "dangerously provocative" and called for restraint. Global oil prices jumped more than 6% in early trading Monday, reflecting market anxiety over potential supply disruptions through the Strait of Hormuz.

The blockade's humanitarian impact is also drawing scrutiny. Aid groups warn that restricting port access could limit the flow of food, medicine, and essential supplies into Iran, affecting millions. The UN has urged all parties to avoid actions that could worsen civilian suffering.

Domestically, the decision has reignited debate over the scope of executive power. Some US lawmakers, including several from Trump's own party, have questioned whether the president can unilaterally impose such a measure without congressional approval. Legal experts say the move sits in a gray zone under international and US law, particularly if it affects neutral shipping.

As the situation unfolds, diplomatic channels remain open, but the window for de-escalation appears to be narrowing. With the UK and other allies holding back support, the US may find itself advancing the blockade largely alone-a shift that underscores growing fractures in its traditional coalition.