France boards stateless Russian tanker for prosecution

A French Navy warship tracked the Tagor for days across the open Atlantic before boarding it west of Brittany. The tanker had switched flags mid-voyage, from Madagascar to Cameroon. Both registrations were invalid. Its Russian captain refused to comply with orders (Maritime Executive). A British warship helped shadow the vessel through the night (NDTV).

The Tagor now sits in Douarnenez Bay under criminal investigation for défaut de pavillon, sailing without a valid flag. France has seized shadow fleet tankers before, but this is the first seizure to trigger criminal prosecution rather than an administrative fine (Euronews). President Macron called sanctions evasion "unacceptable" (DW). France is testing whether physical interception can work as a legal weapon.

One Country Moves While 27 Cannot Agree

France boards these tankers under UNCLOS (the United Nations Convention on the Law of the Sea, the foundational treaty governing maritime rights). Its Article 110 permits warships to stop vessels on the high seas if they fly no valid flag (Völkerrechtsblog). The approach sidesteps the EU's core problem: changing sanctions requires unanimity, meaning all 27 member states must agree, and several maritime nations refuse the strongest measure on the table.

The EU's 21st sanctions package, expected in early June, will target more shadow fleet tankers (Livemint). But the Full Maritime Service Ban, which would prohibit EU companies from insuring, crewing, or servicing vessels carrying Russian oil, remains blocked. According to Euronews Greece, Greece and Malta insist the ban can only happen if the G7 (the club of major Western economies) acts first. Cyprus backed the same position when the 20th package was negotiated. Greek, Cypriot, and Maltese companies earn billions providing maritime services to vessels carrying Russian cargo, which explains why these three governments resist most fiercely.

Poland leads the opposing camp. Seven member states have demanded tighter shadow fleet restrictions (Newsmax Polska). Poland and Denmark have run joint exercises practicing boarding suspected shadow fleet vessels (PolSOF). The gap between those willing to act and those refusing to let them defines this sanctions fight.

The Baltic Standoff

Even the hawks struggle in their own waters. Estonia's foreign minister praised France's boarding as "the right signal" (ERR). But Estonia has acknowledged that boarding in the Baltic carries too much risk: Russian escort vessels shadow the tankers and deter enforcement at the point of contact. Denmark controls the only chokepoints into the Baltic, the Danish Straits, and has conducted zero boardings.

France can operate in the open Atlantic because Russian naval escorts are absent there. In the Baltic, where shadow fleet traffic is densest, proximity to Russian bases changes the calculus entirely. Enforcement happens where it's safest, not where it's most needed.

Russia is also adapting. It has been systematically reflagging shadow fleet vessels to its own registry (Ukrainska Pravda). A vessel flying a valid Russian flag is no longer stateless and cannot be boarded under UNCLOS Article 110. If Russia completes that re-registration campaign, the legal pathway France depends on closes. No alternative exists without UN Security Council authorization, which Russia would veto.

The Tagor sits in a French bay, its captain facing criminal charges. Ship by ship, Russia is closing the loophole that made the boarding possible in the first place.