The United States naval blockade of Iran is now in effect, as President Donald Trump’s administration attempts to compel Tehran to accept terms for ending their ongoing war by targeting the Iranian economy.
The blockade began at 14:00 GMT on Monday, and Iranian armed forces have labeled it “an illegal act” amounting to “piracy.”
While Iran has adapted to US sanctions and continued economic activity during the war, analysts suggest a blockade could inflict significant economic damage.
How will the blockade hurt Iran’s oil revenue?
Iran primarily exports oil and gas through its ports. Following the start of the US-Israel war on February 28, Iranian authorities effectively closed the Strait of Hormuz, a waterway through which 20 percent of the world’s oil and gas supplies pass in peacetime.
This near-closure caused global oil and gas prices to surge, and Iran subsequently controlled access to the strait, allowing passage only to ships from countries with individual agreements with Tehran. However, Iran continued to export its own energy products through the strait.
According to trade intelligence firm Kpler, Iran exported 1.84 million barrels per day (bpd) of crude oil in March, and 1.71 million bpd so far in April, compared to an average of 1.68 million bpd in 2025. From March 15 to April 14, Iran exported 55.22 million barrels of oil, with prices ranging from $90 to over $100 per barrel.
This resulted in approximately $4.97 billion in oil revenue for Iran over the past month, a 40 percent increase compared to the $3.45 billion earned in February before the war began.
However, with the US military now blockading Iranian ports and the Strait of Hormuz, experts believe Iran’s capacity to export crude oil has been substantially impacted. Mohamad Elmasry, a professor at the Doha Institute for Graduate Studies, stated that Iran “would not be able to export oil, at least not at the same level” and would lose potential revenue from tolls collected from non-Iranian vessels.
Frederic Schneider, a nonresident senior fellow at the Middle East Council on Global Affairs, agreed that the recent period had been financially beneficial for Iran, but predicted this would change with the blockade.
As of Monday, maritime intelligence agency Windward reported that approximately 157.7 million barrels of Iranian oil were on the water, with 97.6 percent destined for China. Windward warned that all of this oil could be affected by the US blockade.
Will trade of other goods be impacted?
The US blockade extends beyond oil, potentially impacting Iran’s trade of other goods, including petrochemicals, plastics, and agricultural products exported to countries like China and India. Major imports to Iran include industrial machinery, electronics, and food sourced from China, the United Arab Emirates, and Turkiye.
Data released by Iran’s Customs Administration showed that the country’s total nonoil trade reached $94 billion from March 21, 2025, to January 20, with imports exceeding exports, resulting in a trade deficit. Analysts believe the blockade will disrupt Iran’s overall trade and harm its economy, potentially leading to domestic shortages.
Are there alternate routes Iran can explore?
Iran and China have developed a railway line to reduce reliance on crucial waterways like the Strait of Hormuz. A freight train carrying goods from China first arrived in Iran in February 2016, and a direct rail link between the two countries was officially launched in May. Geopolitical consulting agency SpecialEurasia reports this railway helps mitigate risks of naval interdiction, particularly for Iranian oil transported on “ghost ships” – vessels that disable tracking systems to evade sanctions.
However, there is currently no evidence that oil is being transported by rail from Iran to China.
Schneider stated that the seriousness and duration of the blockade remain unclear, and that China’s response will be a key factor. He noted that “most of the Iranian tankers are headed for China, and see China giving in to this blockade,” and similarly expressed doubt that the US Navy would seize or sink Iranian ships.
Frequently Asked Questions
What prompted the US to implement a naval blockade of Iran?
The United States implemented the naval blockade as a means of pressuring Iran to accept terms for an end to their ongoing war, aiming to squeeze the Iranian economy.
How much oil was Iran exporting prior to the blockade?
According to Kpler, Iran exported 1.84 million barrels per day (bpd) of crude oil in March and 1.71 million bpd so far in April, compared to an average of 1.68 million bpd in 2025.
Is there a way for Iran to bypass the blockade?
Iran and China have developed a railway line to reduce dependency on the Strait of Hormuz, but there is currently no evidence that oil is being transported by rail from Iran to China.
Given the complex dynamics at play, will this blockade ultimately lead to a de-escalation of conflict, or will it further entrench the positions of both sides?
