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U.S. Airstrikes on Iran’s Nuclear Sites Escalate Conflict and Propel Oil to Five-Month High

Investors are weighing risks to global supply after Tehran threatened to close the Strait of Hormuz in response to the strikes.

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A map showing the Strait of Hormuz and Iran is seen behind a 3D printed oil pipeline in this illustration taken June 22, 2025. REUTERS/Dado Ruvic/Illustration
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Overview

  • U.S. forces struck the Fordow, Natanz and Isfahan nuclear facilities on June 21 in Washington’s first direct action in the Israel-Iran conflict.
  • Brent crude jumped as much as 5.7% to $81.40 per barrel, marking its highest level since January, while U.S. benchmarks rose more than 4%.
  • Asian stock markets opened lower and U.S. equity futures declined as traders priced in potential energy shortages and heightened geopolitical risk.
  • Iran’s parliament approved a motion to close the Strait of Hormuz—through which about one-fifth of global oil passes—raising the threat of severe supply disruptions.
  • Tehran’s foreign minister said Iran reserves “all options” for retaliation, including targeting U.S. military bases in the region.