India has seized three US-sanctioned tanker ships linked to Iran this month and stepped up surveillance in its maritime zone to curb illicit trade, a source with direct knowledge of the matter 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 added.
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 to 18 per cent from 50 per cent, as New Delhi has agreed to stop Russian oil imports.
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 said in a post on social media on February 6 that they had intercepted three vessels about 100 nautical miles (185 kilometres) west of Mumbai after detecting suspicious activity involving a tanker in India's exclusive economic zone.
The post was later deleted, but the source now confirmed that the vessels had been escorted to Mumbai for further investigation.
The Indian Coast Guard has since deployed about 55 ships and 10 to 12 aircraft for round-the-clock surveillance in its maritime zones, according to the source.
The US Office of Foreign Assets Control last year sanctioned the vessels Global Peace, Chil 1, and Glory Star 1 with IMO numbers identical to the ships 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.
(Reporting by Saurabh Sharma; editing by Andrei Khalip)
