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Iran vows to halt all oil transit through key shipping lane
Tehran has warned it will prevent any vessels from passing through the Strait of Hormuz, a critical chokepoint for global energy supplies, escalating tensions in the Gulf region.
Strategic waterway at the heart of global oil trade
The Strait of Hormuz, a narrow passage separating Iran from Oman and the UAE, handles roughly one-fifth of the world's oil and gas shipments. At its narrowest point, the channel spans just 33 kilometers (20 miles), making it a vulnerable bottleneck for tankers carrying crude from Gulf producers like Saudi Arabia, Iraq, and Qatar.
In 2025, an estimated 20 million barrels of oil transited the strait daily, representing nearly $600 billion in annual energy trade, according to U.S. Energy Information Administration data. Around 3,000 ships navigate the route each month, including supertankers bound for major importers such as China, India, and Japan.
Economic fallout from potential blockade
Analysts warn that even the threat of disruption has already driven up oil prices, with Brent crude briefly surging to $82 per barrel after attacks on three vessels near the strait over the weekend. Approximately 150 tankers remain stranded, while shipping costs have skyrocketed-rates for chartering a supertanker from the Middle East to China have nearly doubled to over $400,000, per London Stock Exchange Group data.
"The strait is effectively closed," said Arne Lohmann Rasmussen, chief analyst at Global Risk Management. "No insurer will cover ships, and the risk of attack is too high. If this persists, the market will face severe shortages."
Regional powers brace for supply chain chaos
Asia would bear the brunt of a prolonged closure, with 82% of the strait's oil exports destined for the continent in 2022. China, which imports 90% of Iran's oil, could see ripple effects across its manufacturing sector, potentially inflating prices for global consumers.
Gulf nations, including Saudi Arabia, would also suffer. While Riyadh operates pipelines bypassing the strait, diverting oil would still slash daily exports by 8-10 million barrels, according to Reuters. The UAE's Fujairah pipeline offers an alternative route, but its capacity is limited to 1.5 million barrels per day.
Military posturing and historical precedent
Iran's Revolutionary Guard (IRGC) and conventional navy possess the firepower to enforce a blockade, including fast attack boats, submarines, and anti-ship missiles. However, experts note that U.S. military intervention-such as the 1980s "Tanker War" operations-could swiftly reopen the strait.
Under UN maritime law, Iran and Oman share control of the strait's territorial waters, but Tehran has not detailed its strategy. Laying naval mines or targeting commercial vessels are among the most likely tactics.
"Iran's threats are a calculated risk. They know a full closure would provoke a U.S. response, but even partial disruption achieves their goal of destabilizing global energy markets,"
a Middle East security analyst told CBS News.
Diplomatic standoff deepens
Tehran's move follows recent U.S. and Israeli strikes in the region, which Iran frames as provocation. With oil revenues hitting a decade-high $67 billion in 2025, Iran may see economic leverage as its strongest retaliatory tool.
For now, the stand-off leaves the world's most vital oil artery in limbo-with no clear resolution in sight.
