Iran Partially Closes Strait of Hormuz Amid Nuclear Talks and US Military Presence
Iran partially closed the Strait of Hormuz on Tuesday, February 17, 2026, citing security precautions as the Revolutionary Guard conducts military drills in the waterway. This action coincides with ongoing nuclear talks between the U.S. And Iran in Geneva, raising concerns about potential disruptions to global oil supplies and escalating regional tensions.
Strategic Importance of the Strait of Hormuz
The Strait of Hormuz is a critical chokepoint for global energy markets, linking crude producers in the Middle East with key markets worldwide. Approximately 13 million barrels of crude oil transited the strait in 2025, representing roughly 31% of global seaborne crude flows . It is roughly 21 miles wide at its narrowest point, connecting the Persian Gulf to the Gulf of Oman.
Context of the Closure
This marks the first time Iran has shut parts of the Strait of Hormuz, although threats to do so have been made in the past, particularly during periods of heightened tension with the United States. The closure occurred as the Islamic Revolutionary Guard Corps (IRGC) initiated a large-scale exercise dubbed “Smart Control of the Strait of Hormuz” . Iranian state media reported live missile tests during the drills, stating that missiles launched from inside Iran and along its coast struck their targets in the Strait .
US Response and Regional Tensions
The U.S. Military’s Central Command has not yet commented on the closure or the Iranian live fire drills. But, the U.S. Has increased its military presence in the Middle East in recent weeks, including the deployment of aircraft carriers and other assets, amid escalating regional tensions. Ayatollah Ali Khamenei, Iran’s supreme leader, openly mocked President Trump even as negotiators met in Geneva, and warned that Iranian forces could strike American naval assets “so hard, it cannot get up” .
Nuclear Negotiations
The temporary closure of the waterway came as the U.S. And Iran held talks in Geneva, seeking to resolve the ongoing dispute over Tehran’s nuclear program. Iranian Foreign Minister Abbas Araghchi stated that both sides reached an understanding of “guiding principles” but fell short of a full deal . US Vice-President JD Vance indicated that while progress was made, significant disagreements remain.
Historical Precedents
While Iran has harassed shipping through the Strait of Hormuz during past conflicts, including the Iran-Iraq war in the 1980s, it has not repeatedly threatened to close the waterway altogether since that time. The current situation is particularly sensitive following widespread anti-government protests in Iran and threats of military action from the U.S.
Impact on Oil Markets
Oil prices initially rose on news of the closure but subsequently erased earlier gains as the talks concluded . Threats to the Strait of Hormuz have historically caused spikes in global energy prices.