Strait of Hormuz Shipping Tensions: Iran’s Strategy and Global Economic Risks

President Donald Trump ordered a naval blockade of the Strait of Hormuz on April 13, 2026, targeting vessels of all nations entering or departing Iranian ports and coastal areas, including those on the Arabian Gulf and Gulf of Oman. The blockade took effect at 10 a.m. ET on April 14, 2026, following the collapse of weekend negotiations between Washington and Tehran.

The U.S. Central Command announced the measure after 21 hours of talks failed to reach an agreement regarding Iran’s nuclear program, control of the waterway, and continued Israeli attacks against the Iranian-backed Hezbollah in Lebanon. The move has halted tanker traffic through the strait, which had only recently begun to increase following a two-week ceasefire announced by Trump last week.

Impact on Global Energy Markets

The blockade has triggered a significant surge in crude oil prices. U.S. WTI futures for May delivery rose more than 8% to $104.40 a barrel, while Brent crude increased over 7% to $101.86. According to Lloyd’s List Intelligence, tanker traffic ground to a halt within hours of the announcement, with at least two vessels turning back from the exit of the strait.

The Strait of Hormuz is a critical global chokepoint, bounded by Iran to the north and Oman and the United Arab Emirates (UAE) to the south. At its narrowest point, the corridor is approximately 33km wide. In 2025, the US Energy Information Administration (EIA) estimated that about 20 million barrels of oil and oil products passed through the strait daily, representing nearly $600bn in annual energy trade.

Beyond crude oil, the waterway is essential for the transport of liquefied natural gas (LNG), with approximately 20% of global LNG passing through the strait. In 2024, Qatar exported about 9.3 billion cubic feet per day (Bcf/d) through the strait, and the UAE exported about 0.7 Bcf/d.

Chronology of Conflict and Blockades

The current blockade follows a period of intense military conflict that began on February 28, 2026, when the United States and Israel launched attacks against Iran. This conflict involved strikes on oil infrastructure in neighboring countries, including Kuwait, Saudi Arabia, and the UAE.

Following those initial attacks, Tehran effectively blocked the waterway. This initial closure was driven partly by the necessity to adjust insurance contracts for oil tankers and by concerns over attacks on shipping causing shipwrecks or unsustainable losses. Because oil producers in the Gulf must shut in wells once local storage fills up, countries including Kuwait and Iraq began curtailing production in early March 2026.

A complete cessation of exports from the Gulf region removes nearly 20% of global oil supplies from the market, with approximately 80% of that volume typically destined for Asia.

Geopolitical Risks and Diplomatic Efforts

The U.S. Naval blockade risks escalating tensions with other nations that purchase Iranian oil, specifically China and India. Analysts have suggested the blockade may be serving as a negotiating tactic, though they warn of potential legal challenges and further escalation.

Prior to the current blockade, Iran and the U.S. Had agreed to a ceasefire conditioned on the guarantee of safe passage through the Strait of Hormuz. Following that announcement, oil prices had briefly plunged by approximately 15%.

Current reports indicate a fragmented situation on the water; while most traffic has halted, some Iranian oil tankers have reportedly succeeded in crossing the strait despite the U.S. Blockade. Simultaneously, some non-Iranian vessels, including Pakistani tankers, have turned back from crossing the strait amid reports of U.S. Destroyers in the area.