It is exceedingly rare for any nation to declare a blockade on another nation everywhere on Earth—yet if any seagoing power can do it, it is probably the US Navy.

The US military is enforcing a blockade on Iran. However, that blockade is not limited to the Middle East—it applies to all ships moving to and from Iranian ports. Indeed, the blockade is global, multi-domain, and strategically expansive, speaking to the US Navy’s capabilities as a true blue-water force. 

Understanding the US Blockade of Iran

The ongoing blockade is not a total closure of the Strait of Hormuz, but a port and coastline blockade specifically. Enforcement areas include Iranian territorial waters and international waters alike. The targets are Iranian-flagged vessels, like “dark fleet” tankers that are transporting oil in defiance of sanctions. The focus is on economic strangulation, not mere chokepoint denial. 

To enforce the blockade, the Navy has deployed Arleigh Burke-class destroyers, submarines, and carrier strike groups. Providing air support are fighters, ISR aircraft, and aerial refueling tankers, which enable all other aircraft other than maintain a persistent presence. But the operational reality is that the waters being patrolled are highly congested, requiring a persistent and vigilant monitoring effort.

Although the anti-Iranian blockade is concentrated in the Persian Gulf—for obvious reasons—the scope of its enforcement is global, extending into the Indo-Pacific. Targets include any vessel supporting Iran. Of course, in order to keep this up, the United States must maintain a continuous maritime pressure everywhere in the world—no easy task, even for the US Navy. The operation is also a test of air and sea integration; the surveillance component would not be possible without the ISR, strike, and naval control elements being fully coordinated with surface vessels who actually conduct the interdictions. In sum, the operation is leveraging naval dominance into economic coercion.

What Consequences Could the Blockade Have?

From a strategic point of view, the blockade carries an escalation risk; nations whose vessels are traveling to Iran might come under pressure from the United States, leading to diplomatic tensions with those vessels’ owners.

Economically, the blockade targets Iranian exports, in the hopes of further strangling Iran into a vulnerable negotiating position. However, global oil markets will be affected here, as the blockade disrupts global supply chains and drives up the price of oil and gas. And the blockade also serves to expand the conflict beyond the Gulf region into a global affair that relies in greater part on allies for assistance.

The precedent of global maritime enforcement blurs the line between regional conflict and global confrontation. Of course, the United States is probably the only nation capable of conducting such a global blockade—at least on paper. So far, there have been no confirmed boardings. But the effectiveness of the blockade outside of the immediate region is hard to gauge; compliance levels are unknown. The operational risks attached to such a sprawling effort are significant; the waters are congested, and miscalculations are inevitable sooner or later.

The takeaway is that the blockade is expanding in scope, combining naval power with economic pressure. What began as a regional operation is evolving into a global maritime campaign against Iran. The durability of the approach will depend on sustained naval presence and allied cooperation. The US will need to manage escalation risks and avoid triggering a wider conflict.   

About the Author: Harrison Kass

Harrison Kass is a writer and attorney focused on national security, technology, and political culture. His work has appeared in City Journal, The Hill, Quillette, The Spectator, and The Cipher Brief. He holds a JD from the University of Oregon and a master’s in Global & Joint Program Studies from NYU. More at harrisonkass.com.

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