The use of false flag vessels in international tanker trade has expanded sharply through 2026, according to a report published by Windward, a maritime intelligence company. The report, authored by Maya Romi and published on Windward’s site, details how sanctioned tankers are increasingly broadcasting flags they are not authorized to fly in order to obscure their operational identity from enforcement authorities.
What Counts as a False Flag Vessel
According to Windward, a falsely flagged vessel is one broadcasting the flag of a country whose maritime administration has not authorized it to do so. This happens either because the vessel is not listed in that country’s official registry, or because the registry itself is fraudulent and lacks international recognition. Windward notes that the International Maritime Organization (IMO) uses this same definition, confirmed via checks with each country’s actual maritime administration, to formally document falsely flagged vessels.
Scale of the Problem
Windward’s Q2 2026 Maritime Risk Report found 275 internationally trading tankers broadcasting the flag of a fraudulent registry during the quarter, down slightly from 290 in Q1 2026. However, Windward reports that the broader falsely flagged fleet tracked by the IMO has continued growing, rising from 470 vessels at the end of 2025 to 580 by Q2 2026.
The report states that around 90% of tankers using fraudulent registries are Western-sanctioned, and that of roughly 430 tankers currently active in the Iran trade, about 62% are falsely flagged while 87% are sanctioned overall. Windward also reports that Russia-linked tankers falsely claimed the flags of Syria and Myanmar for the first time in Q2 2026, while approximately 60 tankers shifted from fraudulent registries to Russia’s own flag during the first half of the year.
Fraudulent Registries and Flag Hopping
According to Windward, 22 distinct fraudulent ship registries have been identified globally, including registries claiming ties to the Netherlands Antilles, Guyana, Guinea, and Madagascar, with Nicaragua and Equatorial Guinea emerging as newly used fraudulent registries in Q1 2026. The report describes these registries as often disowned by the actual named country once fraud is publicly documented, prompting vessels to shift to new fraudulent registries, legitimate flags of convenience, or Russia’s own flag.
Windward also reports that flag hopping — rapidly changing declared flags — declined by 26% in Q1 2026 compared to the previous quarter, which the report attributes to seizure pressure pushing vessels toward more stable false flag identities rather than reduced false flag activity overall.
Does This Matter to You?
Windward’s report states that banks, marine insurers, P&I clubs, charterers, commodity traders, and port authorities all rely on declared flag information as part of counterparty and vessel screening. According to the report, when a vessel’s flag broadcast is fraudulent, screening systems, insurance coverage terms, and know-your-vessel checks may not reflect the vessel’s actual sanctions exposure or ownership reality.
The report notes that detecting false flag vessels requires verification methods beyond the declared flag alone, including cross-referencing against verified maritime registries, ownership tracing, behavioral pattern analysis, and all-source intelligence fusion. Windward states that compliance workflows relying solely on declared flag information are working from data that may not represent the vessel’s actual identity.
Gulf Bunkering does not provide operational or security guidance. This article is for informational purposes only. Operators should consult flag state authorities, P&I clubs, and relevant advisories for decisions relating to transit planning.
Sources: Windward
