Explainers

Foundations

What the shadow fleet is, how a ship gets sanctioned, and what each kind of listing actually prohibits.

• What is the shadow fleet?
  There is no legal definition and no official register, which is why published counts range from under a thousand vessels to well over a thousand. Here is what the term covers and how the estimates are built.
• How a ship gets sanctioned: OFAC, the UK and the EU compared
  The three regimes reach a vessel by different routes, publish different information, and prohibit different things. A step-by-step comparison of designation, publication and effect.
• IMO numbers: why seven digits are the spine of every sanctions list
  A ship can change its name, flag, owner and paint. Its IMO number stays the same for the life of the hull, which is what makes sanctions lists joinable at all.
• Asset freeze, port ban, services ban: what each listing actually prohibits
  The three measures that reach ships do very different things. Confusing them is the most common error in reporting on sanctioned vessels.
• The G7 price cap and the attestation system
  The cap does not ban Russian oil. It permits Western shipping services only where the oil sold at or below a set price, and enforces that with paperwork passed along the chain.
• Who uses the shadow fleet: Russia, Iran, Venezuela and North Korea
  Four sanctioned exporters, four different problems, and four sets of shipping practices that look similar from the outside but are not the same trade.

Evasion mechanics

Flags, registries, AIS, transfers at sea and ownership chains: how the practices work and what they leave behind in the data.

• Flags of convenience and flag-hopping
  Why most of the world fleet flies a flag unrelated to its owners, why that is lawful, and what changes when a ship starts changing registry every few months.
• Fraudulent registries and false flags
  Some ships fly a flag no government ever granted. The IMO has a name for it, a reporting process for it, and a public record of the ships involved.
• AIS: going dark, spoofing, and why a gap is not proof
  The transponder system was built for collision avoidance, not for enforcement. Understanding what it can and cannot show is the difference between a story and a mistake.
• Ship-to-ship transfers: how a cargo loses its origin
  Moving oil between vessels at sea is routine, lawful and old. It is also the single most effective way to break the documentary link between a cargo and where it came from.
• Ownership onions: how to read a shipping ownership chain
  Single-ship companies, management companies and holding companies are normal shipping practice. The same structure is also what makes a designated owner hard to find.
• Management churn: what happens in the weeks after a designation
  The registered owner usually stays put. The manager, the flag and the name often do not. The sequence is visible in the data if you know what to compare.
• Insurance and class: the two certificates that decide whether a tanker can trade
  Protection and indemnity cover and a recognised classification society are what stand between an old tanker and a coastline. Both are concentrated, and both are what sanctions actually squeeze.
• Name changes: tracing a hull through five identities
  Renaming a ship is routine, legal and unrecorded by sanctions lists. Here is why it works as concealment and how the lists let you defeat it anyway.
• The ageing fleet: why old tankers are the story
  The single most consistent feature of the sanctioned fleet is age. That is not incidental, and it is the part of the problem that coastal states can least afford to ignore.
• Crew: who sails these ships
  The people aboard are the least documented part of the shadow fleet and the most exposed. What the public record supports saying, and what it does not.

Enforcement and law

Boardings, delistings, secondary exposure and where allies disagree.

• Boardings, seizures and detentions: what a state may actually do
  The law of the sea is more restrictive than the headlines suggest. Understanding which power is being used, and where, explains why most encounters end with questions rather than a prize crew.
• Stateless vessels and the 'check your flag' approach
  A ship without valid nationality loses the protection its flag would give it. That is why European states started asking passing tankers a simple question.
• Delisting: how vessels come off the lists
  Removals are less reported than designations and harder to track. They also matter more for anyone relying on a record being current.
• General licences and safety carve-outs
  Sanctions regimes deliberately leave holes: for winding down business, for humanitarian goods, and for stopping a damaged tanker from becoming an environmental disaster.
• Secondary sanctions: why a port agent in a third country cares
  The measure that reaches furthest is not the one with the widest formal jurisdiction. It is the one that makes banks and insurers everywhere decide a transaction is not worth the risk.
• Divergence between allies: what the US lists that the EU does not
  The US, UK and EU lists overlap far less than the headlines suggest. The gaps are measurable, and they decide where a sanctioned vessel can still trade.
• Ukraine's War & Sanctions portal: what it is and what it is not
  The largest public shadow-fleet catalogue is published by a military intelligence service and is not a sanctions list. Both halves of that sentence matter.
• Undersea cables and the Baltic: when a sanctions story became a security one
  Anchors dragging across seabed infrastructure changed how coastal states talk about ageing tankers, and gave them reasons to act that have nothing to do with oil.

Practical guides

How to check a ship, how to read each authority's entry, and what to do with what you find.

• How to check whether a ship is sanctioned
  A practical procedure using free, official sources, and an honest account of what each one misses.
• How to read an OFAC, UK or EU vessel entry
  The same ship, printed three ways. A field-by-field annotation of what each authority publishes, and which parts are reliable.
• Red flags for charterers, brokers, port agents and insurers
  The indicators official advisories tell industry to watch for, what each one is actually evidence of, and why no single flag is a finding.
• For journalists: verifying a tanker story in an hour
  A practical sequence for turning a tip, a photograph or a wire report into something you can publish, and the four claims that most often turn out to be wrong.
• How this site builds a vessel history
  The matching rules, confidence levels and known gaps behind every vessel page, written so you can decide how much to trust a given field.

Money and sanctions

Where shipping sanctions meet financial crime.

• Sanctions evasion as money laundering
  The shipping side and the financial-crime side are two views of one operation. Where they meet is the point at which a cargo becomes money in a bank account.
• Following the money from a shadow-fleet cargo
  Trader to shell company to bank to refinery: the payment chain behind a sanctioned cargo, and which links leave a public trace.

Also on this site

• Glossary — the vocabulary of sanctions and shipping, defined plainly.
• Methodology — how these records are built, and what they do not cover.
• Statistics — the fleet in numbers, including where allies diverge.