Jono Maryono
The United States naval blockade of Iran officially commenced at 14:00 GMT on Monday, marking a significant escalation in the ongoing conflict and a deliberate strategy by the Trump administration to exert maximum economic pressure on Tehran. This move aims to compel Iran to accept the U.S. administration’s terms for a cessation of hostilities, leveraging the blockade as a potent tool to squeeze the nation’s already strained economy. Iran’s armed forces have vehemently condemned the blockade, denouncing it as an "illegal act" that "amounts to piracy," underscoring the gravity of the situation and the stark divergence in perspectives between the two nations.
Background and Precedent: A History of Economic Warfare
This latest measure comes as Iran has demonstrated resilience in the face of extensive U.S. sanctions, having continued to function despite significant economic constraints. However, analysts suggest that a naval blockade of this nature could inflict considerably more severe damage than previous sanctions regimes. The U.S. administration’s approach signifies a shift towards more direct and potentially disruptive economic warfare, moving beyond the existing sanctions framework that has been in place for a considerable period. Understanding the potential impact requires a closer examination of Iran’s economic lifelines, particularly its critical energy sector.
The Strait of Hormuz: A Vital Artery Under Threat
Iran’s primary avenue for exporting its crucial oil and gas resources is through its ports, with a significant portion transiting the Strait of Hormuz. This vital waterway, through which approximately 20 percent of the world’s oil and gas supplies pass during peacetime, has been a focal point of regional tension. Following the onset of the U.S.-Iran war on February 28, authorities in Tehran announced a de facto closure of the Strait, severely restricting maritime traffic. This action, intended to exert leverage, led to a surge in global oil and gas prices and allowed Iran to control passage through the chokepoint, permitting only ships from select countries with individual agreements with Tehran.
Despite controlling the Strait, Iran continued to export its own energy products through it. Data from the trade intelligence firm Kpler reveals that Iran’s oil exports via the Strait of Hormuz constitute roughly 80 percent of its total exports. In March, Iran exported an average of 1.84 million barrels per day (bpd) of crude oil, with shipments reaching 1.71 million bpd in early April. This represents an increase compared to the average of 1.68 million bpd recorded in 2025, indicating a period of heightened export activity just prior to the blockade.
Between March 15 and April 14, Iran exported approximately 55.22 million barrels of oil. The price per barrel for its key crude variants – Iranian Light, Iranian Heavy, and Forozan Blend – remained robust, consistently exceeding $90 per barrel and frequently surpassing $100 per barrel over the past month. Even at a conservative estimate of $90 per barrel, Iran’s oil exports during this period would have generated an estimated $4.97 billion. This figure stands in stark contrast to the pre-war earnings, where Iran was generating around $115 million daily, or $3.45 billion per month, in early February. Consequently, Iran had experienced a significant 40 percent increase in oil export revenues in the month preceding the blockade.
The imposition of the U.S. naval blockade, targeting Iran’s ports and the Strait of Hormuz, directly and dramatically curtails this crucial revenue stream, according to experts. Mohamad Elmasry, a professor at the Doha Institute for Graduate Studies, explained to Al Jazeera that Iran’s capacity to export oil would be severely diminished. "Iran would not be able to export oil, at least not at the same level," he stated, adding that Tehran would also be unable to collect transit fees from non-Iranian vessels that were previously permitted passage.
Frederic Schneider, a nonresident senior fellow at the Middle East Council on Global Affairs, concurred, characterizing the preceding six weeks as exceptionally profitable for Iran in terms of oil revenues. However, he emphasized that the U.S. blockade would fundamentally alter this economic landscape. "Iran has some buffer in the form of crude oil reserves in floating tanks, basically parked tankers, which was estimated at about 127 million barrels in February. But that doesn’t mean that the blockade wouldn’t hurt Iran," he cautioned.
Maritime intelligence agency Windward reported that as of Monday, approximately 157.7 million barrels of Iranian oil were at sea, with an overwhelming 97.6 percent destined for China. Windward has warned that all of this oil could be significantly impacted by the U.S. blockade, potentially leading to substantial financial losses for Iran and disrupting supply chains.
Beyond Oil: Impact on Non-Hydrocarbon Trade
The U.S. blockade extends beyond the energy sector, posing a significant threat to Iran’s trade of other goods. Key non-oil exports, including petrochemicals, plastics, and agricultural products, are primarily shipped to countries like China and India. Conversely, major imports, such as industrial machinery, electronics, and food, are predominantly sourced from China, the United Arab Emirates, and Turkiye.
According to a report by the Tehran Times on February 18, Iran’s total non-oil trade reached $94 billion between March 21, 2025, and January 20. This period saw imports outpacing exports, resulting in a trade deficit. Analysts predict that the current blockade will have a detrimental effect on Iran’s overall trade volume and further strain its economy.
Schneider highlighted that disruptions to non-hydrocarbon trade would not only impact revenues but also jeopardize essential supplies, potentially leading to increased domestic shortages in an economy already grappling with the repercussions of pre-war sanctions. "The question will be whether this increased suffering will force Iran to concede defeat or whether it will harden its resolve and escalate the situation. But I doubt this blockade will come into full effect or last very long," he commented, suggesting a degree of uncertainty regarding the long-term viability and scope of the blockade.
Exploring Alternate Routes: The Railway Alternative
In an effort to mitigate reliance on maritime chokepoints like the Strait of Hormuz and the Strait of Malacca, Iran and China have collaboratively developed a significant railway infrastructure. This network, utilizing existing rail lines across Central Asian nations such as Kazakhstan, Uzbekistan, and Turkmenistan, has facilitated the overland transport of commercial goods. The first freight train from China arrived in Iran in February 2016, and by May of the same year, the official launch of a direct rail link between Xi’an, China, and Iran’s Aprin dry port was announced, according to Iran’s Tasnim news agency.
A report by the geopolitical consulting agency SpecialEurasia suggests that this China-Iran railway route serves to "mitigate the risks of naval interdiction by Western forces that hamper Iranian trade, particularly the transport of crude oil by Tehran’s so-called ‘ghost ships.’” These "ghost ships," or "dark ships," operate by disabling their Automatic Identification System (AIS) to evade detection and circumvent sanctions. Shipping data during the conflict has indicated the presence of such vessels transporting oil and other goods.
However, the SpecialEurasia report also notes that "transporting hydrocarbons by rail involves considerable logistical challenges." Crucially, there is currently no credible evidence to suggest that oil has been transported by rail from Iran to China. This alternative route, while strategically important for diversification, may not provide a sufficient immediate solution for circumventing the effects of a comprehensive naval blockade on oil exports.
The Uncertain Future and Geopolitical Dynamics
Schneider reiterated that if the blockade persists, it will undoubtedly inflict significant damage on Iran’s economy. However, he also pointed out the uncertainty surrounding the duration of the standoff over the Strait of Hormuz. "It’s very difficult to say how serious the U.S. is about this blockade, how long it will last, how it will end, and what is coming next," he observed, emphasizing the fluid and unpredictable nature of the geopolitical situation.
A critical "X factor" in this unfolding scenario is China’s reaction. Schneider believes that China is unlikely to capitulate to the blockade, given that the majority of Iranian tankers are bound for its shores. Furthermore, he expressed skepticism about the U.S. Navy’s willingness to engage in direct confrontation by seizing or sinking these vessels.
"So, this is a very volatile situation that will quickly veer into one direction which could be a ceasefire and détente, or the other which could be escalation and the resumption of bombings and missile strikes," Schneider concluded, underscoring the high stakes and the potential for either de-escalation or further intensification of the conflict. The effectiveness and longevity of the U.S. naval blockade, along with the international response, particularly from key trading partners like China, will be pivotal in shaping the immediate future of Iran’s economy and the broader geopolitical landscape of the region.
