The first Iranian ships crossed the area of the US naval blockade without obstruction after a memorandum of understanding was reached to end the war between Washington and Tehran, Iran’s semi-official Fars News Agency reported Tuesday.

At least three Iranian oil tankers and two cargo ships carrying essential goods broke through the US naval blockade following an accord between the countries. 

A large Iranian VLCC and another vessel used to transport livestock moved from open waters toward Iranian ports, the agency said. Another Iranian tanker carrying oil also crossed the Gulf of Oman toward its designated export port, Fars said, without providing further details about the destination.

The crossing followed a WSJ report that under the agreement expected to formally end the war between the United States and Iran on Friday, Tehran would be allowed to immediately resume oil and fuel sales. The sanctions relief takes effect as soon as the agreement is signed and extends beyond crude exports to include the banking, shipping, and insurance services needed to move those barrels to market.

That detail may prove to be one of the most consequential parts of the entire agreement.

Oil sanctions are only effective if buyers can't pay, tankers can't ship, and insurers won't touch the cargo. By waiving restrictions across the entire supply chain, Washington is effectively giving Iran access to international energy markets from day one rather than months down the road, according to OilPrice.com.

Iran holds some of the world's largest oil and gas reserves and was producing well over 3 million barrels per day before the conflict. Much of that production has remained constrained by sanctions, infrastructure limitations, and wartime disruptions. The prospect of Iranian barrels returning to global markets in meaningful volumes could reshape supply expectations just as consumers and governments remain focused on energy security after months of turmoil in the Middle East.

The move also marks a striking shift in U.S. policy. Washington spent years tightening restrictions on Iran's energy sector. Now, the Trump administration appears prepared to use oil revenues as a financial incentive to secure a lasting end to the conflict.

The oil could potentially start flowing the moment the ink dries without the expected waiting period.