New Delhi: India has stepped up surveillance in its maritime zone to curb illicit trade following the seizure of three US-sanctioned oil tankers linked to Iran earlier this month, a source said on Monday.
India aims to prevent its waters from being used for ship-to-ship transfers that obscure the origin of oil cargoes, the source with direct knowledge of the matter told Reuters.
The seizures and heightened surveillance follow an improvement in US-India relations. Washington earlier this month announced it will cut import tariffs on Indian goods to18% from 50%, after New Delhi agreed to stop Russian oil imports.
The three sanctioned vessels – Stellar Ruby, Asphalt Star and Al Jafzia – frequently changed their identities to evade law enforcement by coastal states, the source said, adding that their owners were based overseas.
Iranian state media cited the National Iranian Oil Company as saying that the three tankers seized by India had no connection to the company. It said that neither the cargoes nor the vessels were linked to the company.
Indian authorities had said in a post on X on February 6 that they intercepted three vessels about 100 nautical miles west of Mumbai after detecting suspicious activity involving a tanker in India’s exclusive economic zone.
The post was later deleted, but the source confirmed that the vessels had been escorted to Mumbai for further investigation.
The Coast Guard has since deployed about 55 ships and between 10 and 12 aircraft for round-the-clock surveillance in its maritime zones, according to the source.
The US Office of Foreign Assets Control said last year it had sanctioned three vessels, called Global Peace, Chil 1, and Glory Star 1, with IMO numbers identical to the ships recenty captured by India.
Two of the three tankers are linked to Iran, with Al Jafzia having carried fuel oil from Iran to Djibouti in 2025 and Stellar Ruby flagged in Iran, according to LSEG data.
The Asphalt Star mostly operated on voyages around China, the data show.
Sanctioned oil and fuel are often sold at deep discounts due to the risks involved, with intermediaries moving cargo through complex ownership structures, false documentation and mid-sea transfers that complicate enforcement.
