Nearly 20 Iranian oil tankers idling off Sri Lanka’s southern coast have exposed a vulnerability extending far beyond the vessels themselves: Sri Lanka’s dependence on international shipping, dollar-based finance and foreign markets leaves its ports and private companies increasingly exposed to the reach of U.S. sanctions.
The crisis began after Washington intensified measures targeting Iranian oil exports and companies facilitating the trade. The objective is to deprive Tehran of petroleum revenues that the United States says support Iran’s military and strategic programmes. Recent U.S. sanctions have specifically targeted Iran’s petroleum trade, shipping networks and foreign intermediaries.
The consequences are now visible in Sri Lankan waters.
The Wall Street Journal reports that approximately 20 Iranian tankers are stranded near Sri Lanka and Malaysia, with some vessels running dangerously low on food, drinking water and fuel. Many are reportedly empty and unable to return to Iranian ports because of the sanctions and wider maritime restrictions.
For Sri Lanka, the greatest danger may not be the ships themselves but the secondary-sanctions risk surrounding every service provided to them.
A tanker does not operate independently. It requires bunker fuel, fresh water, food, waste disposal, crew changes, repairs, insurance, agency services, banking and port facilities. Each transaction potentially creates a chain of exposure involving Sri Lankan companies and financial institutions.
This explains why maritime agents and suppliers have reportedly struggled to obtain permission to deliver provisions and fuel. Companies that might normally welcome such business are instead calculating whether a relatively small commercial payment is worth potentially jeopardising access to the U.S. financial system.
Sri Lankan authorities have already begun circulating information about sanctioned vessels to service providers. The Ports and Aviation Ministry has acknowledged the risks of secondary sanctions, while shipping agents have expressed concern over the inability to provide routine services such as crew changes, food and fuel.
This creates an uncomfortable economic paradox.
Sri Lanka desperately needs its ports to generate foreign exchange and establish Colombo as a competitive regional maritime hub. Yet excessive caution could encourage vessels and shipping agents to bypass Sri Lankan ports and use competing facilities in India or elsewhere.
That risk is not theoretical. Sri Lankan shipping representatives have indicated that vessels unable to obtain services locally have been turning toward India.
The impact could eventually reach banking.
A Sri Lankan bank processing a payment linked to a sanctioned entity could face heightened compliance scrutiny and potentially lose access to important correspondent banking relationships. For an economy still rebuilding foreign-exchange reserves after the 2022 crisis, preserving international banking connectivity is strategically vital.
There is also a wider shipping-security dimension. Analysts have described the Iranian vessels gathered near Sri Lanka as part of the broader disruption of Iran’s so-called shadow fleet. More than a dozen Iranian tankers were previously reported near Galle before dispersing into international waters.
The situation places Colombo at the centre of a geopolitical confrontation despite Sri Lanka having no direct role in the U.S.-Iran dispute.
The government therefore faces three simultaneous responsibilities: protect Sri Lankan companies from sanctions, uphold humanitarian principles toward crews and preserve the country’s reputation as a reliable maritime hub.
The larger foreign-policy question is whether Sri Lanka can maintain genuine strategic autonomy while avoiding economic retaliation from Washington.
The answer will depend on whether Colombo establishes a transparent, legally defensible mechanism for dealing with sanctioned vessels rather than allowing individual port officials, banks and suppliers to make decisions based primarily on fear.
The tanker standoff has delivered a powerful warning: in today’s global economy, geopolitical neutrality does not necessarily provide economic immunity.