• The U.S. blockade of Iranian ports and the Strait of Hormuz will stay in effect until a formal agreement with Iran is completed on June 19, according to a U.S. military advisory.
  • Ships are warned not to attempt crossing without explicit direction, as heightened maritime security measures remain fully implemented.
  • The blockade continues to roil global energy markets, with oil prices and shipping insurance costs reacting to the ongoing uncertainty.

U.S. Blockade Remains Fully in Place

A U.S. military advisory issued on Thursday confirmed that the blockade of Iranian ports and the Strait of Hormuz remains fully in effect, pending the completion of a formal agreement with Iran scheduled for June 19. The advisory explicitly warns all vessels that they should not attempt to cross into Iranian waters or the Strait of Hormuz without receiving explicit direction from U.S. naval authorities. According to people familiar with the matter, the blockade has been enforced consistently over recent weeks, with U.S. Navy assets maintaining a visible presence in the region.

Talks Progress Toward June 19 Deadline

Behind the scenes, diplomatic efforts have intensified to finalize a comprehensive agreement that could ease maritime restrictions. Sources close to the negotiations indicate that the June 19 deadline is seen as a potential turning point, though they caution that talks remain fragile. The agreement is expected to address not only the blockade but also broader nuclear discussions and regional security arrangements, including the reopening of the Strait of Hormuz to commercial traffic. “We’re cautiously optimistic, but nothing is done until it’s done,” one official said, speaking on condition of anonymity.

Implications for Energy Markets and Shipping

The continued blockade is already reverberating through global energy markets. The Strait of Hormuz is a critical chokepoint for about 20% of the world’s oil supply, and any disruption there typically sends ripples through prices. Insurance premiums for vessels transiting the Persian Gulf have surged to multi-year highs, according to industry data. Shipping companies are being forced to reroute cargoes, adding days to transit times and driving up freight costs. A spokesperson for a major tanker operator, who declined to be named, described the situation as “extremely challenging,” noting that the uncertainty makes it difficult to plan voyages.

Political and diplomatic reactions have been mixed. Some allied nations have expressed support for a multinational mission to stabilize the strait if diplomacy fails, but no concrete action has been taken yet. The U.S. military advisory did not provide details on the specific terms of the June 19 agreement, but it emphasized that the blockade will not be lifted until a binding deal is reached. Efforts to reach the Iranian mission to the UN for comment were unsuccessful.

Correction: An earlier version of this article misstated the date of the advisory; it has been corrected to June 5.