WASHINGTON – The United States has implemented a naval blockade of Iran, effective as of 14:00 GMT on Monday, April 13, 2026. The administration of President Donald Trump is utilizing the military maneuver to isolate the Iranian economy and pressure Tehran into accepting terms to end the ongoing conflict.
The move follows a period of increased revenue for Tehran, which capitalized on higher energy prices and control over the Strait of Hormuz following the start of the US-Israel war on Iran on February 28, 2026.
Iran’s armed forces have condemned the blockade, describing it as “an illegal act” that “amounts to piracy”.
Impact on Energy Exports
The blockade specifically targets the Strait of Hormuz, a critical maritime chokepoint through which roughly one-fifth of the world’s traded oil and gas supplies pass during peacetime. For decades, the waterway has been treated as an international strait under the transit passage provisions of the United Nations Convention on the Law of the Sea, even though the United States has not formally ratified the treaty. Tehran previously restricted the waterway, allowing only vessels from countries with individual deals to pass.
Despite these tensions, Iranian energy exports increased in the weeks leading up to the blockade. According to data from trade intelligence firm Kpler:
- March crude oil exports: 1.84 million barrels per day (bpd)
- April crude oil exports (to date): 1.71 million bpd
- 2025 average exports: 1.68 million bpd
Between March 15 and April 14, Iran exported 55.22 million barrels of oil. With prices for Iranian light, Iranian heavy, and Forozan blend variants remaining between $90 and $100 per barrel, Tehran earned an estimated $4.97 billion in the past month.
This represents a 40 percent increase over the $3.45 billion earned monthly in early February before the war began.
Mohamad Elmasry, a professor at the Doha Institute for Graduate Studies, stated that the blockade will directly hit Tehran’s capacity to export crude oil. “Iran would not be able to export oil, at least not at the same level,” Elmasry said, adding that the Iranians “wouldn’t be able to get tolls” from non-Iranian vessels.
Energy analysts note that any sustained disruption at Hormuz is likely to ripple through global energy markets, forcing import-dependent governments in Asia and Europe to weigh emergency stockpile releases and alternative sourcing policies.
Maritime Reserves and Chinese Trade
The effectiveness of the blockade may be tempered in the near term by Iran’s existing oil reserves. Frederic Schneider, a nonresident senior fellow at the Middle East Council on Global Affairs, noted that Iran held approximately 127 million barrels in floating tanks as of February.
However, a significant volume of oil is currently exposed at sea. Data from the maritime intelligence agency Windward shows that as of Monday, April 13, 2026, there were 157.7 million barrels of Iranian oil on the water.
Of this total, 97.6 percent was destined for China. Windward warned that the US blockade could impact all of these shipments, confronting Beijing with a choice between openly challenging US naval enforcement or accepting major short-term supply disruptions.
Diplomats in Washington and European capitals say the scale of seaborne Iranian exports to China makes the blockade not only a bilateral US-Iran confrontation, but a test of how far major importers are prepared to go in contesting unilateral maritime enforcement actions.
Non-Oil Trade and Domestic Supply
The naval restrictions extend beyond hydrocarbons to impact a broader range of imports and exports across Iran’s ports. Iran’s port trade includes the shipment of petrochemicals, plastics, and agricultural products to India and China.
Key imports sourced from China, Turkiye, and the United Arab Emirates include:
- Industrial machinery
- Electronics
- Food supplies
Data from Iran’s Customs Administration indicated that total non-oil trade reached $94 billion between March 21, 2025, and January 20, 2026.
Schneider argued that disrupting non-hydrocarbon trade could lead to increased domestic shortages in an economy already strained by pre-war sanctions. He questioned whether such pressure would force a concession or lead to further escalation.
Western officials have framed the blockade as an extension of long-running sanctions policy aimed at constraining Iran’s regional military activities. Iranian officials, in turn, accuse Washington of collective punishment and of weaponizing global supply chains at a moment when ordinary households are already struggling with inflation and currency weakness.
Terrestrial Alternatives and Ghost Shipping
To mitigate the risk of naval interdiction, Iran and China have expanded a direct rail link. A freight train from Xi’an, China, now arrives at the Aprin dry port in Iran, utilizing railway lines through Turkmenistan, Uzbekistan, and Kazakhstan.
This terrestrial route is designed to circumvent Western naval forces and the dependency on the Strait of Hormuz and the Strait of Malacca.
The route also supports the use of “ghost ships” or “dark ships.” These vessels avoid detection and sanctions by disabling their automatic identification systems (AIS) to hide their movements, a tactic that has drawn increased scrutiny from maritime insurers and flag registries.
While the railway facilitates the movement of commercial goods, a report by geopolitical consulting agency SpecialEurasia noted that transporting hydrocarbons by rail presents significant logistical challenges. There is currently no credible evidence that oil is being transported by rail from Iran to China.
As of Monday, April 13, 2026, approximately 157.7 million barrels of Iranian oil remain on the water, with 97.6 percent of those shipments destined for China. Regional diplomats say how the United States enforces the blockade in coming days will be closely watched by allies and rivals alike as a real-time test of US power projection and of the balance between freedom of navigation and coercive economic statecraft.
