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The United States military has begun a mine clearance operation in the Strait of Hormuz, a vital waterway for global oil and gas supplies, in response to Iran's alleged laying of sea mines. The operation, led by guided missile destroyers USS Frank E Peterson and USS Michael Murphy, aims to establish a 'safe pathway' for the free flow of global commerce.Iran's Islamic Revolutionary Guard Corps (IRGC) recently released a map of the Strait of Hormuz showing a safe route for ships to follow through the strait, directing vessels farther north towards the Iranian coast and away from the traditional route closer to the coast of Oman. The IRGC stated that all vessels must use the new map for navigation due to 'the likelihood of the presence of various types of anti-ship mines in the main traffic zone.'The stakes are high, with one-fifth of the world's oil and liquefied natural gas (LNG) supplies having been shipped through the Strait of Hormuz before the war. Even a single mine can compel operators to assume a wider threat, effectively invalidating insurance and shutting down their use of the waterway.Iran's stockpile is estimated to number 2,000 to 6,000 mines, a significant portion of which are produced domestically. These mines generally fall into three categories: contact mines, bottom (influence) mines, and 'smart' and rocket mines.The US Navy is facing a 'mine gap,' with experts calling for institutional neglect that led to the retirement of dedicated mine countermeasures (MCM) assets. The current US strategy relies on small combat ships built for coastal operations and fitted with MCM mission modules, but only one of these vessels, the USS Canberra, is currently available in the region.

The Iranian military has strongly condemned the US plan to blockade its ports, calling it an act of piracy. The blockade, set to begin on Monday at 14:00 GMT, would restrict all vessels entering or departing Iranian ports. The Iranian army has warned that if its ports are threatened, no port in the Persian Gulf and Arabian Sea would be safe.The US Central Command has stated that the blockade would be enforced impartially against vessels of all nations entering or departing Iranian ports. However, the military would not impede vessels transiting the Strait of Hormuz to and from non-Iranian ports. The Strait of Hormuz is a critical route for global oil and gas shipments.Oil prices surged almost 8 percent on Monday, with both key WTI and Brent contracts topping $100 a barrel. The increase comes amid concerns over the potential impact of the blockade on global energy supplies.The move has been criticized by China, which urged Iran and the US not to reignite the war. Spain's Defence Minister Margarita Robles said the planned naval blockade 'makes no sense', while UK Prime Minister Keir Starmer stated that Britain would not join the US blockade.

British Prime Minister Keir Starmer declared that the United Kingdom will not participate in the United States’ proposed blockade of the Strait of Hormuz, distancing London from President Donald Trump’s latest escalation against Iran.Speaking on BBC Radio, Starmer said, "We are not supporting the blockade," and added that the UK will not be "dragged into the US‑Israel war on Iran."The Strait of Hormuz is a strategic chokepoint through which about 20 % of the world’s oil supplies transit in peacetime. Starmer stressed that reopening the waterway is vital for global energy security and that the UK’s diplomatic efforts over recent weeks have focused on that goal.Meanwhile, the US Central Command announced it would block all maritime traffic entering or leaving Iranian ports from 14:00 GMT, though it provided few details on how the blockade would be enforced. The statement claimed the action would be applied impartially to vessels of all nations, yet it also noted that ships bound for non‑Iranian ports would not be impeded.President Trump, in a lengthy social‑media post, framed the operation as a mission to clear mines and prevent Iran from profiting from control of the strait.In a parallel diplomatic move, French President Emmanuel Macron said France and the United Kingdom will convene a conference in the coming days aimed at restoring freedom of navigation, reaffirming that “no diplomatic effort will be spared” to end the US‑Israel conflict over Iran.Nicole Grajewski, an assistant professor at Sciences Po, warned that the US blockade constitutes “more than a minor coercive signal” and effectively marks a resumption of hostilities.Other allies echoed criticism: Spanish Defence Minister Margarita Robles called the plan “makes no sense,” Turkish Foreign Minister Hakan Fidan urged “negotiations with Iran and the swift reopening of the strait,” and Chinese Foreign Ministry spokesman Guo Jiakun emphasized that the strait’s security is “in the common interest of the international community.”Starmer’s stance reflects a careful balancing act—maintaining NATO solidarity while refusing to endorse direct military pressure on Iran—highlighting the complex geopolitics surrounding one of the world’s most crucial maritime corridors.

The U.S. military announced that, starting at 14:00 GMT on Monday, it will enforce a blockade of every Iranian port, a step taken after President Donald Trump ordered a naval closure of the Strait of Hormuz—the waterway through which roughly one‑fifth of global crude oil normally flows. The blockade comes on the heels of stalled peace negotiations in Islamabad, where talks between Washington and Tehran collapsed without an agreement despite a prior cease‑fire pledge. Trump’s escalation has already driven crude prices above $100 per barrel and unsettled Asian equity markets, with the Nikkei 225 down 0.84%, the Topix slipping 0.42% and South Korea’s Kospi falling 1.83%. Iran’s response is equally forceful. The Islamic Revolutionary Guard Corps warned that any vessel entering the strait would be deemed a breach of the cease‑fire and dealt with “harshly and decisively,” insisting it has “full control” and threatening a “deadly vortex” for any misstep. Navy chief Shahram Irani dismissed Trump’s threat as “ridiculous and funny,” while state television said Iranian forces are closely monitoring U.S. movements. Foreign Minister Abbas Araghchi lamented “maximalism, shifting goalposts, and blockade” that undermined a near‑final Islamabad memorandum, quoting, “Good will begets good will. Enmity begets enmity.” Parliament speaker Mohammad Bagher Ghalibaf pledged resistance and mocked U.S. gasoline prices, posting a map of Washington‑area pump prices and predicting nostalgia for $4‑$5 gas. U.S. Central Command clarified that the blockade will stop all vessels bound for or from Iran, while traffic to non‑Iranian ports will continue unhindered. Trump also warned that any ship that has paid an “illegal toll” to Iran will be intercepted on the high seas, and he publicly criticized Pope Leo XIV for urging an end to the conflict. In Lebanon, Israeli airstrikes have killed at least five people, bringing the country’s overall death toll to 2,055. Hezbollah retaliated with a rocket barrage aimed at northern Israeli towns, citing violations of a cease‑fire. The United Nations Interim Force in Lebanon (UNIFIL) reported that an Israeli tank rammed peace‑keeping vehicles twice in the south. Israel’s Prime Minister Benjamin Netanyahu visited troops on the Lebanese border, claiming that Hezbollah’s invasion threat has been neutralized, though he acknowledged that hostilities continue within the security zone. On the energy front, shipping through the Hormuz corridor has “immediately halted,” according to Lloyd’s List, with several vessels turning back after the blockade announcement, further tightening global oil supplies.

President Donald Trump has signaled that the U.S. Navy will enforce a blockade of the Strait of Hormuz, targeting any vessel that has paid a toll to Iran. The announcement sent oil futures soaring past $100 per barrel on Monday, reviving fears of a deeper global energy crisis. U.S. Central Command later clarified that the operation would focus on ships entering or leaving Iranian ports, a narrower scope than the initial threat to shut the entire strait. Nonetheless, experts say the move would still choke a critical chokepoint in world oil supply. "Anything that removes oil from the market pushes prices higher, which in turn lifts gasoline costs," explained Trita Parsi, co‑founder of the Quincy Institute. He warned that if Iran’s allies, notably the Houthis in Yemen, retaliate by closing the Bab al‑Mandeb strait, oil could surge above $150 a barrel. Bab al‑Mandeb serves as an alternative route for Gulf oil to reach the Red Sea and Indian Ocean. Its closure would compound the disruption already caused by the Hormuz threat. Since the start of the U.S.–Israeli conflict on February 28, Iran has limited traffic through Hormuz, allowing only a handful of vetted ships. Windward estimates that about 3,200 vessels were stranded west of the strait as of Saturday. Former chief economist Anas Alhajji of NGP Energy Capital Management expects non‑Iranian carriers to avoid the strait regardless of U.S. assurances, citing rising insurance premiums and the risk of Iranian retaliation. "The Trump blockade of Iranian ports is effectively a blockade of the Hormuz Strait," he told Al Jazeera. The ripple effects extend beyond fuel. Higher oil and gas prices will lift the cost of chemicals, fertilizers and plastics feedstocks, analysts say. Cameron Johnson, senior partner at Tidalwave Solutions, predicts a rapid increase in raw‑material prices if the blockade persists into late April or early May. "The wild card is the timeframe," Johnson noted. "If it’s a short‑term negotiating tactic, the market may absorb it, but a prolonged blockade will spike global commodity prices." Supply‑chain experts warn of broader repercussions. Deborah Elms of the Hinrich Foundation highlighted that rising fabric costs and packaging shortages could strain food production and consumer goods later in the year. Industry observer Chad Norville of Rigzone said the mere threat erodes confidence in the strait’s stability, likely driving up insurance costs and reducing daily trade volumes. In sum, a U.S. blockade of Iranian ports would mark a stark reversal of recent policy, which had briefly eased sanctions to alleviate the energy crunch. The potential escalation underscores how geopolitical moves can quickly translate into higher energy bills and broader economic strain worldwide.

The United States military confirmed that, beginning at 10 a.m. Eastern Time (14:00 GMT) on April 13, all maritime traffic entering or leaving Iranian ports will be blocked. The directive, issued by U.S. Central Command (CENTCOM), targets vessels of every nation operating in the Gulf and the Gulf of Oman, but explicitly excludes ships merely transiting the Strait of Hormuz to non‑Iranian ports, marking a narrower scope than former President Donald Trump’s broader strait‑wide threat. This decisive action follows the abrupt end of marathon peace talks in Islamabad, where negotiators failed to secure a memorandum of understanding with Tehran. The stalemate has revived fears of renewed hostilities, prompting the U.S. to leverage maritime pressure as a bargaining chip. Financial markets reacted sharply: U.S. crude oil prices surged 8 % to $104.24 per barrel, while the benchmark Brent crude rose 7 % to $102.29. The spikes reflect investor anxiety over potential disruptions to the flow of oil and liquefied natural gas that currently passes through the Strait of Hormuz, a chokepoint responsible for roughly one‑fifth of global energy shipments. Since the February 28 launch of a joint U.S.–Israel operation against Iran, the strait’s traffic has dwindled to a trickle. Iran continues to navigate its own vessels and has allowed limited passage for foreign ships, while discussing a post‑conflict toll system for the waterway. In response to the blockade threat, Iran’s Islamic Revolutionary Guard Corps warned that any U.S. warship attempting to enforce the measure would breach the existing U.S.–Iran ceasefire—set to expire on April 22—and would be "dealt with severely." Iranian Foreign Minister Abbas Araghchi blamed the United States for the diplomatic failure, accusing U.S. negotiators of "shifting the goalposts" when a deal was "just inches away." Academic commentary echoed regional concerns. Zohreh Kharazmi, an associate professor at the University of Tehran, asserted that the United States "is not in a position to dictate" Iranian maritime movements and warned that a prolonged standoff would quickly reveal which side—"the resilience of the Islamic Republic or the resilience of global markets"—would suffer first. While the blockade targets Iranian ports, CENTCOM emphasized that it will not impede freedom of navigation for vessels merely passing through the Strait of Hormuz, a subtle but significant concession aimed at avoiding a full‑scale maritime confrontation.

Oil prices experienced a significant surge following US President Donald Trump's announcement of a naval blockade on Iran. Brent crude, the international benchmark, rose more than 8 percent to top $103 a barrel on Sunday.The blockade, which was later clarified by US Central Command to only affect vessels traveling to and from Iran, is set to take effect on Monday at 10am Eastern Time (14:00 GMT). This move has heightened uncertainty in global financial markets, with major stock markets in Asia opening lower on Monday.The Strait of Hormuz, a critical conduit for about one-fifth of global oil and natural gas supplies, has been a focal point of tensions between the US and Iran. Despite a fragile truce between the two nations, only 17 vessels crossed the strait on Saturday, down from roughly 130 daily transits before the conflict.The blockade threat has stoked fears of supply disruptions, contributing to the rise in oil prices. This development comes after oil prices had fluctuated significantly in recent weeks, topping $119 last month before falling below $92 a barrel last week.Global markets are closely watching the situation, with US stock futures and Asian markets experiencing declines. Japan's benchmark Nikkei 225 fell 0.9 percent, while South Korea's KOSPI dropped more than 1 percent.

Tanya Khovanova has long been a leading voice in the world of recreational mathematics, authoring a popular blog and running the Number Gossip site where enthusiasts can inquire about any number.She now debuts her first book, Mathematical Puzzles and Curiosities, co‑written with fellow puzzle‑enthusiasts Ivo David and Yogev Shpilman. Published by World Scientific, the volume offers fresh challenges and inventive twists on classic problems.To give readers a taste, Khovanova selected three puzzles for the Guardian column:1. Battleships – As a naval admiral you must choose between sending a single vessel with a success probability of P % or two vessels each with a P/2 % chance, where the mission succeeds if at least one ship does. Which strategy maximises the odds?2. The Two Oracles – You face two respondents, Randie, who answers randomly, and Rando, who randomly decides to tell the truth or lie before each answer. Is there a method to distinguish them?3. Bad Maths – A student computes 5548 − 5489 as 59, claiming the “548” cancels out. He then experiments with a subtraction of the form XXYZ − XYZW (distinct digits) and observes the result is XW. How many digits in the new expression match those in the original calculation?Solutions to the trio were later posted online (update), but readers were urged to avoid spoilers until the scheduled reveal.Khovanova also reminds fans that she has been curating puzzles for the Guardian every other Monday since 2015 and welcomes new submissions via email.

Oil prices jumped back above $100 a barrel and global stocks fell after weekend talks between the US and Iran ended without an agreement and Donald Trump imposed a blockade of the Strait of Hormuz. The US president announced the blockade on Sunday, targeting Iranian vessels and ships that have paid a toll to Iran for passage through the strait, in an attempt to choke off the flow of Iranian oil.US Central Command said it would start at 10am ET (5.30pm in Iran and 3pm in the UK), blocking all Iranian Gulf ports and coastal areas, in effect seizing control of maritime traffic in the Strait of Hormuz. The news drove oil and gas prices sharply higher again, after the two-week ceasefire between the US and Iran announced on Wednesday prompted a sharp fall in energy prices, and crude ended the week below the psychological $100 a barrel threshold.Brent crude rose by nearly 7% to $101.74 a barrel on Monday morning, while US crude is up more than 8% to $104.69 a barrel. Gas prices also increased, with the British wholesale gas contract for May soaring by 11.7% to 122.5p a therm. Analysts at JPMorgan Chase said last week they expected oil prices to stay high in the second quarter, above $100 a barrel, before easing in the second half of the year.Most Asian stock markets fell on Monday, with Japan’s Nikkei down 0.7% and Hong Kong’s Hang Seng index losing 1%, while Chinese stocks rose slightly. Sentiment was helped by Beijing’s announcement of a 10-initiative strategy aimed at deepening ties with Taiwan. European stocks also fell, led by airlines including Lufthansa, Wizz Air, easyJet and British Airways parent IAG. The FTSE 100 index in London lost 0.4%, dropping 45 points to 10,555. Germany’s Dax fell 1%, Italy’s FTSE MiB slipped 0.7% and Spain’s Ibex was down 1.1%. With oil and gas prices rising sharply higher, energy companies such as BP and Shell are rallying.Priyanka Sachdeva, senior market analyst at the broker Phillip Nova, said: “In today’s environment, every barrel of risk added to oil markets carries an inflation price tag for the global economy.” She added: “The market reaction underscores a simple but powerful reality: Hormuz risk is not theoretical; it is structural, and it is real.”Interest rate expectations have shifted again; investors now see an 84% chance of two rate increases from the Bank of England this year to tackle rising inflation, up from 60% on Friday. Before the Iran war, the central bank was expected to cut rates. The price of gold fell 0.4% to $4,730.75 an ounce as the blockade fuelled inflation concerns, prompting traders to scale back expectations for Federal Reserve rate cuts this year.