Sweden has lifted its operating ban on the sanctioned Russian shadow fleet tanker Sea Owl 1 after nearly seven months at anchor off Trelleborg, but the vessel's EU sanctions designation remains fully intact.

The Swedish Transport Agency confirmed Monday that Equatorial Guinea has directly verified the tanker's registration, clearing the last administrative obstacle to its departure from Swedish waters.

Why was the Sea Owl 1 detained?

Authorities boarded the vessel on March 12 off Sweden's southern coast over concerns about its seaworthiness and registration status. The Swedish Coast Guard found the tanker falsely flying the flag of Comoros. A May attempt to reflag to Cameroon also proved invalid, leaving the ship effectively stateless — without any recognized flag state.

The Transport Agency has now reviewed the vessel's certificates and crew documentation and found them satisfactory to the extent they could be verified.

"For us, it was essential to obtain reliable confirmation directly from the flag state. This has taken time and required extensive work, but we have now received the information needed to lift the detention order," said Pernilla Wallin, a unit head at the Swedish Transport Agency.

What does the release actually change?

In practical terms, very little for the vessel's commercial position. The Sea Owl 1 remains on the European Union's sanctions list over its involvement in Russia's oil trade. Swedish authorities say the tanker has transported petroleum products between Russia and Brazil in recent years.

The Coast Guard emphasized the vessel is not suspected of sanctions violations. Two of its captains were previously investigated for suspected offenses, including the use of false documents, but all investigations have since been closed.

With the ban lifted, the agency says no restrictions now prevent the tanker from departing. Its next flag-state jurisdiction — Equatorial Guinea, rather than Comoros or Cameroon — will determine how, and whether, it can continue trading Russian cargo.

How common are these flag irregularities?

The case illustrates the verification challenge facing European authorities as they police Russia's shadow fleet. A single vessel managed two invalid flag registrations in under three months.

"A vessel that disregards international agreements and regulations by falsely flying a flag, not once but twice, is taking serious risks with safety in shipping lanes and along our coasts," said Daniel Stenling, deputy head of operations at the Swedish Coast Guard.

Stenling welcomed the vessel's departure after what he described as an unusually long period at anchor off Sweden.

What enforcement continues in Sweden?

Swedish authorities have stepped up enforcement against vessels with questionable registration and safety documentation. Two other ships remain under active measures:

• Caffa — seized in March, still held in Trelleborg
• Jin Hui — prohibited from operating since May

The Sea Owl 1's release, after seven months and a successful third flag registration, suggests Stockholm will detain shadow fleet tonnage until a legitimate flag state provides direct confirmation — a standard that keeps detentions slow but hard to dispute. Expect further boardings around Trelleborg and Sweden's southern approaches as that enforcement posture tightens.