TEHRAN, July 12 — A key strategic waterway that moves a significant portion of the world’s oil is now effectively closed to commercial shipping, and the man who ordered it is the same figure who has held Iran’s highest office for decades. Supreme Leader Ali Khamenei has directed the closure of the Strait of Hormuz, an extraordinary escalation that transforms a longstanding threat into a concrete act of economic warfare. Think of the strait like a narrow highway on-ramp that the global oil tanker fleet must use.
When that on-ramp is blocked, nothing gets on the highway. The practical upshot for anyone who drives a car, heats a home, or buys goods shipped by container vessel: energy prices and supply chains are about to feel a sharp jolt.
In plain terms, this is the single most consequential choke-point disruption since the Suez Canal blockage in 2021 — only this one is deliberate and state-ordered. Khamenei has been Iran’s Supreme Leader since June 4, 1989, when he succeeded the revolution’s founder, Ruhollah Khomeini. He is the highest-ranking political and religious authority in the country, and his decisions are final in matters of state — including this one.
He controls the armed forces, most notably the Islamic Revolutionary Guard Corps (IRGC), which is the branch responsible for enforcing the strait’s closure. The IRGC’s commander is appointed directly by Khamenei.
He also holds the constitutional power to declare war and peace. Born on July 17, 1939, in the northeastern city of Mashhad, Khamenei was a key figure in the 1979 Islamic Revolution and later served as Iran’s president from 1981 to 1989. His worldview has been remarkably consistent across four decades: he has consistently opposed U.S. influence in the Middle East and has called for the destruction of Israel.
The United States placed him under sanctions in 2019.
Nuclear program and the JCPOA
Khamenei has supported Iran’s nuclear program, which led to the 2015 Joint Comprehensive Plan of Action — the nuclear deal negotiated between Iran and world powers. The JCPOA was designed to limit Iran’s uranium enrichment in exchange for sanctions relief. The practical upshot of Khamenei’s backing: the program advanced to the point where it became a central bargaining chip in international diplomacy, and the deal itself became one of the most contentious foreign-policy issues in Washington.
His health has been a subject of persistent speculation. Reports emerged in 2014 that he underwent surgery for prostate cancer.
At his advanced age, questions about succession have circulated for years, though no formal public transition plan has been disclosed.
What to watch next
The closure of the Strait of Hormuz represents a direct challenge to global shipping and to the U.S. Navy’s Fifth Fleet, which is based in nearby Bahrain. The strait sits between Iran and Oman, connecting the Persian Gulf to the Gulf of Oman and the open ocean. For the U.S. administration, the question is not whether to respond, but how — and how quickly — to restore passage through waters that have been a cornerstone of global energy security for decades.
For the rest of the world, the answer will show up in the price at the pump and in the cost of goods on store shelves.
