The Pulse | Diplomacy | South Asia

Iranian Ships Test Sri Lanka’s Sovereignty Again

The U.S. has threatened Sri Lanka with sanctions if it provides supplies to Iranian vessels stranded off its coasts.

On Sept. 30, 2026, the Wall Street Journal (WSJ) reported that U.S. officials threatened Sri Lanka with sanctions if it continued supplying around 20 Iranian tankers stranded off its coast. According to WSJ, the tankers are running short of food, fuel, and fresh water.

Sources in Sri Lanka’s Foreign Ministry told The Diplomat that the U.S. embassy in Colombo and visiting American civilian and military officials have repeatedly warned Sri Lanka against providing the Iranian vessels with essential supplies, despite the potential humanitarian crisis. Sri Lanka’s national security establishment reportedly objected to these demands and called on the government to convey its displeasure to Washington, as they are opposed to leaving the Iranian crew stranded and suffering.

With the WSJ report, the matter has now become public, restricting the maneuvering space of the Sri Lankan government.

The incident reveals the limits of sovereignty of small states like Sri Lanka that depend on exports to the Global North. Washington has considerable means to punish any resistance from Sri Lanka, and the question before Colombo now is how it can protect its economic interests while retaining the freedom to provide basic humanitarian assistance to friendly nations.

Foreign Minister Vijitha Herath has tried to distance the government from any private suppliers who might be supplying the stranded Iranian ships. Speaking to the Sunday Times, Herath said that the authorities had identified 15 Iranian vessels among 47 foreign ships outside Sri Lanka’s territorial waters. He confirmed that Iran had requested essential supplies for the stranded ships but said that the government had provided nothing and did not intend to do so.

Herath described provisioning the ships as a private business. Companies could make their own decisions, he said, after considering the possibility of U.S. secondary sanctions. Foreign Ministry spokesman Thushara Rodrigo told local media that U.S. sanctions apply globally and that these are not threats targeted at one country.

Colombo’s caution has an obvious economic explanation. The Export Development Board’s report for the first six months of 2026 puts the United States’ share of Sri Lanka’s merchandise exports at approximately 22 percent. The European Union accounts for 25.5 percent, with Britain providing another substantial market. These figures explain why Sri Lankan policymakers worry about disputes with Western governments.

Yet accepting every U.S. demand also carries costs.

If Colombo does not provide drinking water to hundreds of stranded Iranians due to the fear of economic punishment, it invites........

© The Diplomat