Moscow Shields Its Shadow Fleet

The Sea of Azov was never built for a naval war. It is shallow, enclosed and awkward to move through. This month, that geography worked in Ukraine's favour. Kyiv sent maritime drones against Russian tankers and said it had hit more than 147 vessels in 11 days. Moscow then suspended navigation through the Don-Azov Canal and the Kerch Strait (The Guardian, Kyiv Independent/Reuters).

The revealing move came afterwards. Russia pulled drone operators and air-defence troops from the frontline to protect the tankers (Euromaidan Press).

That tells you more than another sanctions announcement from Brussels. Moscow now treats its sanctions-evasion fleet as military infrastructure, valuable enough to be guarded by combat units. Ukraine is turning the shadow fleet into a battlefield target. Europe still largely treats it as a compliance problem.

The workaround that carries 54% of Russian oil

The shadow fleet is not a single fleet in any tidy sense. It is a loose web of ageing tankers, opaque ownership structures, regular flag changes, manipulated tracking signals and insurance outside the Western system. Its job is simple: move Russian oil around the EU and G7 price cap.

That cap does not ban Russian oil exports. It blocks Western firms from providing shipping, insurance and related services for Russian crude sold above a set price. Once the cargo moves onto vessels beyond that service chain, Western leverage weakens. By June 2026, about 54% of Russia's seaborne fossil-fuel exports were travelling on shadow tankers (CREA, The Insider).

Ukraine is now attacking that workaround with explosives. The campaign has gone after fuel routes into Crimea and occupied southern Ukraine, hitting tankers, tugboats and cargo vessels (Times of India/Reuters). Russia, in the same period, struck Odesa, Chornomorsk and Izmail, linking the tanker campaign to Ukraine's grain-export corridor (BBC, gCaptain).

There is a limit to what can be claimed. Market intelligence suggests the Sea of Azov is not Russia's main export artery. Many of the vessels hit appear to have been smaller coastal craft rather than the large crude carriers that bring in the serious money (Hamer). Russia can also adapt, pushing more traffic through Novorossiysk and other Black Sea terminals (IndexBox).

Europe enforces unevenly

The EU listed 189 additional shadow-fleet vessels in its 17th sanctions package last year (Council). Yet sanctioned tankers were still moving through European waters while the 21st package was being negotiated (EUobserver). Putting a ship on a list is not the same as stopping it.

The Netherlands wants powers to stop and detain vessels that are stateless or falsely flagged. The Dutch government has sent an urgent amendment to its foreign-ships law to the Council of State, the body that reviews legislation before parliament votes on it. The proposal would allow inspections and detention at ports, locks and certification checkpoints (SWZ Maritime).

Dutch officials are also looking beyond sanctions. They argue that shadow-fleet vessels could be used for espionage or sabotage against North Sea data and electricity cables (Rijksoverheid). The legal difficulty is the old one at sea: innocent passage. Properly flagged ships can move through territorial waters without interference, provided they pose no threat. That makes enforcement easier at chokepoints than in open water.

Greece is at the other end of the argument. Athens resisted limits on transporting Russian LNG to third countries during the 21st sanctions talks (Euronews). Its case is that badly designed bans push cargo away from regulated European carriers and towards more opaque operators, without actually cutting Moscow's income (Cyprus Mail).

There is something to that argument. If sanctions simply move business from insured Western ships to darker fleets, Russia still exports and Europe knows less about what is moving. But it also gives Athens leverage inside the Council, where sanctions need unanimity and any single member state can block. Greece and Cyprus, both major shipping states, can defend globally powerful fleets while presenting resistance as practical realism.

Who pays for what

The costs are not shared evenly. Ukraine spends drones and takes Russian retaliation on its ports. Coastal states such as Romania live beside a widening maritime war. Shipping states protect revenue and argue that they are preserving oversight. Russia reroutes.

The next call sits with the EU Council: whether shipping states can keep shielding maritime business while Ukraine carries the military cost of enforcing what Europe's own sanctions have not managed to stop.