Speaking during a Pentagon briefing on Friday, Hegseth said the U.S. military campaign originally focused on the Strait of Hormuz and Iranian coastal waters has widened to include Iranian-linked vessels operating across international sea lanes.

According to officials, U.S. forces have already intercepted or turned back more than 30 ships suspected of transporting Iranian oil or violating sanctions, as part of a broader effort to restrict Tehran’s export capacity and maritime influence.

Expansion of maritime enforcement

Hegseth described the blockade as “fluid and expanding,” indicating that U.S. naval operations are no longer limited to the Gulf region.

“Any vessel that meets the criteria whether heading to or from Iranian ports or linked to sanctioned networks is subject to interdiction,” he said, according to officials present at the briefing.

He added that the operation is being supported by additional naval deployments, including an expanded carrier presence in the Middle East and Indian Ocean regions, aimed at tracking Iran’s so-called “shadow fleet” of oil tankers.

Recent military actions include the seizure of tankers in the Indian Ocean and the interception of ships accused of transporting Iranian crude outside legal export channels.

Strategic chokepoint under pressure

The blockade is heavily concentrated around the Strait of Hormuz, a critical maritime chokepoint through which roughly one-fifth of global oil flows. U.S. officials say Iran has attempted to assert counter-control over shipping lanes, including imposing tolls and briefly restricting passage during heightened tensions.

The U.S. maintains that the maritime operation is designed to enforce sanctions and deter what it describes as Iranian destabilization of global energy routes.

Escalating military and diplomatic tension

The expanded blockade comes amid ongoing U.S.–Iran tensions that have included ship seizures, drone activity and competing claims of control over Gulf shipping lanes. Recent operations have seen both sides detain or redirect commercial vessels, increasing instability in one of the world’s most important energy corridors.

At the same time, Washington has kept diplomatic channels open. Hegseth reiterated that Iran still has an opportunity to reach a negotiated settlement with the United States, warning that continued defiance would bring further economic and military pressure.

“This blockade is the polite version of what can happen next,” he previously warned, signaling that military escalation remains on the table if negotiations fail.

Global implications

Analysts warn that the widening maritime crackdown could have significant consequences for global oil markets, shipping insurance costs and supply chain stability. Oil prices have already risen sharply amid disruptions in Gulf shipping routes.

Meanwhile, diplomatic efforts remain fragile, with no confirmed breakthrough in ceasefire or long-term agreement talks between Washington and Tehran.

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Speaking during a Pentagon briefing, Hegseth described the attack as swift and decisive.

“An American submarine sunk an Iranian warship that thought it was safe in international waters,” Hegseth said. “Instead, it was sunk by a torpedo a quiet death the first sinking of an enemy ship by a torpedo since World War II.”

Details of the Engagement

According to senior U.S. defense officials, the incident occurred late Tuesday in what they described as a strategically sensitive maritime corridor. The precise location has not been publicly disclosed, but officials confirmed the encounter took place in international waters.

Military sources said the Iranian vessel was engaged after U.S. commanders assessed it posed an imminent threat to American naval assets and regional stability. The submarine involved in the strike has not been identified for operational security reasons.

No U.S. casualties were reported.

Iranian state media acknowledged the loss of a naval vessel but condemned the strike as an act of aggression. Tehran has not yet released details regarding casualties or the specific class of ship involved.

Rising Regional Tensions

The sinking marks a sharp escalation in tensions between Washington and Tehran. Relations have deteriorated in recent months amid disputes over maritime security, regional proxy conflicts and freedom of navigation operations.

Defense analysts say submarine warfare remains one of the most potent and stealth-driven tools in modern naval strategy. Unlike surface engagements, submarine attacks are often undetectable until impact giving little opportunity for defensive response.

“This demonstrates the continued strategic relevance of undersea dominance,” said one military expert. “Submarines remain among the most survivable and lethal assets in any navy.”

Historical Significance

While naval skirmishes have occurred since 1945, confirmed torpedo sinkings of enemy warships between sovereign nations have been exceedingly rare in the postwar era. During World War II, submarine campaigns in both the Atlantic and Pacific theaters were decisive in shaping the outcome of the conflict.

Military historians note that the reported strike underscores how quickly geopolitical tensions can escalate into direct confrontation.

International Reaction

Global reaction was swift. Several allied governments urged restraint, calling for both sides to avoid further escalation. The United Nations Security Council is expected to convene in emergency session to address the incident.

Energy markets responded immediately, with oil prices rising amid fears of potential disruptions to shipping lanes in the region.

What Comes Next?

Pentagon officials stressed that the United States does not seek broader conflict but will continue to defend its forces and uphold international maritime law.

“Our objective remains deterrence,” a senior defense official said. “We will protect our personnel, our allies and freedom of navigation.”

As diplomatic efforts intensify behind the scenes, the sinking of the Iranian warship marks a pivotal moment in U.S.–Iran relations and a rare modern instance of submarine warfare dramatically reshaping the strategic landscape overnight.

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