US-Iran Conflict Escalates as Trump Threatens Strikes and Oil Prices Surge Past $100
The United States and Iran are locked in the most dangerous confrontation in decades, with oil prices surging past $126 per barrel following the closure of the Strait of Hormuz, a catastrophic rift opening within NATO as European allies refuse to grant US military access to their bases, and diplomatic efforts repeatedly collapsing under the weight of military action and intractable demands.
The crisis has its roots in the Trump administration's renewed "maximum pressure" campaign, which began in March 2025 when President Trump sent a letter to Iranian Supreme Leader Ali Khamenei demanding new nuclear negotiations, setting a 60-day deadline and threatening "serious military consequences" if his proposal was rejected. The US demands included the complete dismantlement of Iran's nuclear programme, a halt to all uranium enrichment, and an end to Iran's support for regional proxy groups — terms Tehran rejected outright.
Background
The confrontation between Washington and Tehran has been building for years, rooted in the collapse of the 2015 Joint Comprehensive Plan of Action. Since early 2021, Iran had ceased implementing its JCPOA commitments, ending IAEA monitoring of key activities. By May 2025, Iran had amassed a record stockpile of 60% highly enriched uranium — over 408 kilograms — with the IAEA noting there was no credible civilian justification for producing uranium at such a high purity level.
The US backed its diplomatic ultimatum with a formidable military presence, deploying approximately 50,000 troops to the Middle East and establishing its largest air force presence in the region since 2003. US embassies in Iraq and other regional states began evacuating personnel by June 2025 amid threats from Iran and its allies, signalling that the administration was prepared to follow through on its threats.
On June 12, 2025, the IAEA formally declared Iran in breach of its non-proliferation obligations. The following day, Israel launched large-scale attacks targeting Iranian military leadership and nuclear scientists. The US joined the offensive on June 21, conducting strikes against key Iranian nuclear facilities at Fordow, Isfahan, and Natanz — marking the first time a US president explicitly joined Israel in a preemptive attack on another nation's nuclear programme.
Key Developments
Despite a temporary ceasefire following Iran's retaliatory missile attack on US forces in Qatar, hostilities erupted on a far larger scale on February 28, 2026, with the commencement of what has been termed the "2026 Iran war." US and Israeli strikes aimed at degrading Iran's nuclear and ballistic missile capabilities resulted in the death of Supreme Leader Ali Khamenei and other senior Iranian officials. President Trump subsequently issued an ultimatum for Iran's "unconditional surrender," threatening to destroy "every single power plant, and every single bridge" if Tehran did not capitulate and reopen the Strait of Hormuz.
Iran's closure of the Strait of Hormuz — through which approximately 20% of the world's oil and gas supplies transit — sent global energy markets into turmoil. Oil prices surged to over $126 per barrel, with the World Bank projecting that global energy prices could increase by an average of 24% in 2026, reaching their highest levels since the Russian invasion of Ukraine in 2022. The amount of crude oil held on stationary tankers globally increased by 25% in a single week in April 2026, reaching 153 million barrels as shipping companies scrambled for alternative routes.
A fragile ceasefire was mediated by Pakistan and announced on April 7, 2026, but talks quickly stalled over fundamental disagreements: the US demand for "zero enrichment," Iran's insistence on its right to a civilian nuclear programme, and Tehran's demand for $270 billion in compensation for damages.
Why It Matters
The US-Iran conflict represents a fundamental rupture in the post-Cold War international order. The destruction of the IAEA inspection regime — Iran's parliament voted to suspend all cooperation with the agency following the June 2025 strikes — means the world now has less visibility into Iran's nuclear programme than at any point in two decades. The conflict has not resolved the nuclear question; it has made it more dangerous and more opaque.
The economic consequences are being felt across the globe. Sustained high energy prices are driving inflation, threatening economic growth, and disproportionately affecting lower-income households. The disruption to global shipping routes is adding costs throughout supply chains, from manufacturing to food production. The World Bank's projection of a 24% average increase in global energy prices in 2026 represents a significant headwind for economies still recovering from post-pandemic pressures.
The NATO rift is perhaps the most consequential long-term consequence. The refusal of Spain, Italy, and initially the UK to grant US military access to their bases has exposed deep divisions over European strategic autonomy that will not be easily healed.
Local Impact
For households and businesses across the UK, the surge in global oil prices is translating directly into higher energy bills, increased fuel costs, and rising prices for goods transported by road and sea. The UK government faces difficult choices about energy security and its relationship with both Washington and its European partners. Starmer's initial decision to block the use of British bases — before reversing within 24 hours — illustrated the acute political difficulty of navigating between the US alliance and European solidarity.
What's Next
As of early May 2026, a fragile ceasefire holds, but the fundamental drivers of the conflict remain unresolved. Trump has agreed to extend the ceasefire pending a new proposal from Tehran, but the gap between US demands and Iranian red lines remains vast. The US is seeking international assistance to reopen the Strait of Hormuz, while Iran continues to use the blockade as its primary leverage. Without a significant diplomatic breakthrough, the risk of a return to catastrophic hostilities remains dangerously high.
Comprehensive analysis of the conflict's implications for UK policy is available from the House of Commons Library. The latest IAEA reporting on Iran's nuclear programme is published at iaea.org. Reuters provides ongoing coverage of oil market developments at reuters.com.
