There is an important distinction.

The U.S. operation targets vessels entering or leaving Iranian ports and coastal areas. U.S. Central Command has said it is not intended to prevent ships traveling through the Strait of Hormuz between non-Iranian ports.

That matters because describing the operation simply as a “Hormuz blockade” can give the impression that the United States has closed the entire waterway.

The latest US warning comes after months of fighting, intermittent ceasefire arrangements and negotiations aimed at restoring navigation through Hormuz.

A potential deal appeared within reach earlier this month, with Iran, the United States and Oman discussing arrangements for reopening the waterway. But the negotiations have since stalled, with Tehran maintaining demands over sanctions, compensation, military activity and the terms governing navigation.

The blockade is designed to squeeze Iran economically by restricting its ability to export oil and receive maritime trade.

But the economic pressure does not stop at Iran's borders.

The International Energy Agency (IEA) has sharply reduced its 2026 global oil-supply forecast.

It now expects global supply to fall by about 4.3 million barrels per day, or roughly 4%, with the market facing a projected 1.27 million-bpd deficit relative to demand.

Markets can tolerate a temporary disruption more easily than an open-ended one.

If traders believe Hormuz will reopen within days or weeks, they can draw on inventories, reroute some cargoes and wait for normal flows to resume.

An indefinite confrontation is different.

It encourages refiners, airlines, shipping companies and governments to assume that disrupted supplies may persist — forcing them to compete for alternative crude, build inventories and pay more for transportation and insurance.

That can translate into higher fuel costs, tighter diesel supplies and renewed inflationary pressure far beyond the Middle East.

And the longer the disruption lasts, the harder it becomes to restore the old trading system quickly even after a political deal.

Hegseth's comments reveal the asymmetry Washington is trying to exploit.

The Pentagon can rotate ships, aircraft and personnel. But Iran faces the loss of export revenue and increasing economic isolation.

Yet the United States also faces a cost.

Keeping major naval forces deployed indefinitely places pressure on crews, maintenance cycles and readiness elsewhere. The USS Abraham Lincoln, for example, has been at sea for more than 260 days, with the USS George Washington now moving toward the region as a replacement.

So “indefinitely” does not mean without cost.

It means Washington believes it can sustain the cost longer than Tehran can sustain the economic pressure.