The big questions to ask this morning about the Russia shadow fleet tanker interdiction in the English Channel are: what was the legal basis and has Cameroon finally acted on its rogue registry which is the second-largest provider of flag services to shadow fleet tankers after Russia?
Two Cameroon-flagged Russia tankers diverted from their intended course via the English Channel this morning after the very high-profile interception and boarding by British armed forces of Smyrtos (IMO 9389100) overnight.
There are dramatic images Royal Marines sliding down ropes from helicopters on to the ship. Cameroon-flagged Smyrtos (according to its AIS and Equasis database), was built in 2009, and had loaded at the Russian Baltic port of Ust Luga.
Absent from the feverish media coverage is the legal basis. Smyrtos was sanctioned by the UK in October 2025 and the EU in July 2025 and *appears* to be legitimately flagged. If so, the tanker has the right of innocent passage under international law.
However, earlier this month the Cameroon government announced it was cleaning up its ship registry,
Dozens of tankers had reflagged to Cameroon over the past six months because they were using fraudulent ship registries and effectively stateless. This was the legal basis for interdiction efforts seen across the Baltic, Atlantic and Mediterranean over the past 18 months and this vulnerability meant tankers had to find a "legitimate" flag. This is the 12th Russia shadow fleet tanker intercepted and boarded by European or UK authorities so far in 2026 we have tracked at
@WindwardAI
The last tanker Tagor (IMO 9282481) was boarded by French authorities with UK support on May 31. That tanker was falsely flagged with the fraudulent ship registry of Madagascar.
The targeting of the Cameroon-flagged vessel comes months after the UK government pledged in February to deal with UK sanctioned shadow fleet tankers regularly sailing through its waters. The military operation saw Smyrtos boarded via helicopter and then redirected to the coastal waters off southern England.
The vessel "met the requirements" for boarding a government spokesman said on the BBC this morning without further explanation. He flagged further tankers would be targeted. So far that hasn’t deterred 3 sanctioned shadow fleet tankers tracked through the Channel today. But they are not flagged with Cameroon. Those that are have diverted.
So lots of headlines, little information. If this ship has been deflagged from Cameroon (but the IMO’s database has yet to keep up), that’s confusing. If the UK has found another legal basis to board and detain beyond article 110 of UNLCOS (stateless), then that’s interesting.
My money is that Cameroon’s government has worked out that its registry has been hijacked by some rogue officials and that there is no legal basis for the registration of the 130-plus shadow fleet tankers. They might not have communicated that to official databases, but obviously told the UK government.
Watching with interest.