Iran escalated tensions with the United States on Monday by threatening to halt all oil exports from the Persian Gulf if Washington continues its economic pressure campaign.

Mohsen Rezaei, secretary of Iran’s Supreme National Security Council, stated on X that “not a single drop of oil will be exported, neither through the Strait of Hormuz nor from anywhere in the Persian Gulf” if the economic measures proceed. Rezaei further warned that any country participating in or supporting the U.S. effort would be viewed by Tehran as committing “an act of war.”

The statement came as the United States prepared to roll out additional sanctions described by Treasury Secretary Scott Bessent as the “endgame” of efforts against Iran. President Trump has characterized the push as the “most crushing economic operation” against Tehran, urging allies to isolate the regime and warning of “tremendous” consequences for entities continuing trade.

The Strait of Hormuz remains a critical chokepoint, carrying roughly 20 percent of global seaborne crude oil and liquefied natural gas shipments before recent disruptions. Iranian authorities have already blacklisted 45 tankers for alleged violations of new transit rules and threatened fines, detention, or cargo confiscation for noncompliant vessels, including some linked to UAE and Saudi operators.

The latest warning builds on months of heightened confrontation that began earlier this year. Iranian officials have repeatedly signaled willingness to disrupt energy flows in response to sanctions and naval measures aimed at curbing Tehran’s support for proxy forces and nuclear activities.

Global energy markets have shown sensitivity to the rhetoric, with analysts noting potential upward pressure on prices should exports face prolonged interruption. U.S. officials maintain that the sanctions target Iran’s ability to fund destabilizing activities without broadly harming legitimate commerce by allies.

Rezaei’s remarks specifically targeted Gulf neighbors, cautioning them against cooperation with Washington. The exchange underscores ongoing strategic competition in the region over energy routes and economic leverage.