Under the Russian Flag: Reflagging and the Future of Shadow Fleet Enforcement

Since 2022, Russia has assembled a shadow fleet of ageing tankers to circumvent western sanctions on its energy exports.

A defining feature of this fleet has been its deliberate avoidance of the Russian flag: vessels have been registered under flags of convenience to obscure their connection to Russia and shield Moscow from direct state responsibility. The recent emergence of a segment of vessels adopting the Russian flag represents an apparent reversal of that founding logic.

Reflagging poses an immediate challenge for enforcement: the Russian flag neutralises the most effective legal hook available to European coastal states, the classification of stateless or falsely flagged vessels under UNCLOS, which has triggered every successful boarding to date. Yet the trajectory is also its opposite. The shadow fleet rests entirely on opacity—on Russia operating hundreds of vessels while denying any link to them, imposing risks on European coasts without bearing responsibility for any of them. The Russian flag dismantles precisely this.

If the current dynamic is to be preserved, Europe will have to supply the pressure the United States is relinquishing, applying secondary logic through the levers it controls: access to its market, its financial system, and its services. The apparent paradox that heavier pressure would drive still more vessels toward the Russian flag is not the purpose: every ship that trades a flag of convenience for the Russian registry restores precisely the link of state responsibility the shadow fleet was built to sever.