Sanctions Evasion Reference

Shadow fleet

A loosely defined group of ageing tankers with opaque ownership and insurance that carry sanctioned or price-capped cargo outside mainstream shipping arrangements.

also known as

dark fleet, parallel fleet

reviewed

2026-08-20

The term is journalistic rather than legal, and different users draw its boundaries differently. What the vessels described by it tend to share is age, single-ship ownership companies in secrecy jurisdictions, frequent changes of name and flag, insurance that cannot be verified, and irregular AIS behaviour.

This site treats the shadow fleet as a set of techniques rather than a list of ships. Vessel-level identification is out of scope and is kept on the sister vessels site.

Where this term is used

  • What is AIS manipulation and AIS spoofing? — Disabling a ship's position transponder, or transmitting false position data through it, so that the vessel's recorded track does not show where it actually went.
  • What is flag hopping? — Re-registering a ship repeatedly between flag states, often to registries with limited oversight, so that its regulatory history is broken and its documented identity keeps changing.
  • What is opaque marine insurance? — Presenting protection and indemnity or hull cover from a provider that cannot be identified, or whose ability to meet a claim cannot be established, in order to satisfy a requirement to be insured.
  • What is price cap attestation fraud? — Providing a false or unsupported statement that oil was bought at or below a capped price, so that shipping, insurance and financing services remain available for a cargo that does not qualify.
  • What is a ship-to-ship transfer? — Transferring cargo directly between two vessels at sea, rather than through a port, so that the cargo changes hands where there is no port authority, no customs entry and no independent record.

Related terms

  • Flag of convenience — Registration of a ship in a state with which its owners have no genuine connection, chosen for cost, tax or regulatory reasons.
  • Automatic Identification System — A mandatory maritime transponder system that broadcasts a vessel's identity, position, course and speed to nearby vessels and shore stations.
  • Price cap — A measure permitting specified services for seaborne oil only where the cargo was bought at or below a stated price, enforced through the service providers rather than at the border.
  • Protection and indemnity club — A mutual association of shipowners that provides third-party liability cover, including for pollution, which ports and states generally require before a vessel may trade.

Sources

  1. Sanctions Advisory for the Maritime Oil Industry and Related Sectors. U.S. Department of the Treasury, Office of Foreign Assets Control, 2023. Price cap advisory, 12 October 2023.
  2. Guidance to Address Illicit Shipping and Sanctions Evasion Practices. U.S. Department of State, U.S. Department of the Treasury and U.S. Coast Guard, 2020. Global maritime advisory, 14 May 2020.

All glossary terms