Iran will announce a "restricted zone" outside the Strait of Hormuz in the coming days, and any vessel attempting to transit the area without coordination with Tehran will be placed on Iran's sanctions list, Secretary of Iran's Supreme National Security Council Mohsen Rezaei said on Sunday.

In an interview with state-run IRIB TV, Rezaei said that the zone would extend from "the line where the US naval blockade begins to the Strait of Hormuz region and inside the Persian Gulf on the other side (of the strait)."

Ships that enter the zone without coordination with Iran, he added, would face sanctions affecting their insurance coverage and future passage through the waterway.

Rezaei framed the move as part of a broader strategic shift in Iran's approach to war and diplomacy, aiming at increasing pressure on Washington.

The security official stressed that the strait is completely closed, dismissing the US claim that ships and oil tankers are crossing the waterway as a "lie."

While acknowledging that some vessels attempt to cross the strait via a route near Oman, often switching off their navigation systems to evade detection, Rezaei said most of those ships "receive blows."

Yet he added that Iran does not intend to sink them for now due to environmental concerns.

Rezaei further revealed that Iran had test-fired for the first time a domestically developed anti-destroyer missile above a US aircraft carrier 48 hours ago, describing it as a warning that the US naval blockade is vulnerable. "The special missile created a hell for the Americans, and they fled," he added.

Iran, Oman to establish new corridor for Strait of Hormuz passage

Rezaei also said the strait would remain closed unless the United States takes practical steps to fulfill its obligations under a peace memorandum of understanding signed between Tehran and Washington in June.

In the coming days, he added, a new international corridor designated by Iran and Oman for passage through the strait would be announced, emphasizing that the corridor would be under Iran's management.

Following US-Israeli strikes on Iran on February 28, Tehran restricted passage through the Strait of Hormuz, while US forces imposed a naval blockade targeting vessels traveling to or from Iranian ports and coastal areas.

The US Central Command said on X that "As of September 6, US forces have redirected 92 commercial vessels, disabled 3 and boarded 2 to ensure strict compliance."

Iran vows 'heavier response' to aggression

The standoff has also fueled increasingly sharp rhetoric from Iranian officials. Iranian Parliament Speaker Mohammad Baqer Qalibaf said on Sunday the US must know that any "aggression" against Iran's interests and security will receive a "faster, heavier and more painful" response.

He made the remarks at an open session of the legislative body in Tehran, stressing that the "era of proportionate responses" has come to an end, according to the Iranian parliament's ICANA news agency.

"The Americans must have understood that the era of proportionate responses has ended. Our strikes against the aggressor's bases in recent operations were only the beginning," Qalibaf said.

"The rules of the game have changed, and from now on, any aggression against Iran's interests and security will receive a faster, heavier, and more painful response," he added.

Tensions between Tehran and Washington have escalated in recent weeks after the US carried out strikes on southern Iran, prompting retaliatory attacks by Iran on US bases in the region. The strikes were followed by naval confrontations between the two sides on Saturday.

(With input from agencies)