The seizure of a Russian-linked oil tanker in the North Atlantic has highlighted “worry” among NATO and Nordic-Baltic governments over dark fleet vessels and the type of crews onboard, according to a maritime intelligence analyst.

U.S. military and Coast Guard personnel boarded the Marinera between Iceland and the U.K. Wednesday as it operated under deceptive shipping practices, including flying a false flag and violating sanctions.

According to Reuters, Russian authorities demanded the humane treatment and repatriation of the crew members.

Windward maritime intelligence analyst Michelle Wiese Bockmann claimed the Marinera’s ownership had just been transferred to Burevestmarin LLC, a Russian company.

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“We do not know the status of these sailors and seafarers, who are Russian nationals,” Wiese Bockmann told Fox News Digital. “That lack of clarity is common with dark fleet tankers.

“The Marinera did have its ownership transferred to a newly formed Russian company, with the registered owner, ship manager and commercial manager being Burevestmarin LLC.”

She also suggested NATO and the Nordic-Baltic 8+ group of governments have been “worried” about sanctioned oil tankers with unauthorized personnel onboard, including “armed guards.”

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“Increasingly, and I know the Nordic Baltic 8+ governments are worried about the fact that you are having unauthorized people also on board, also known as armed guards,” Wiese Bockmann said. “But it is highly irregular.

“Armed guards are rarely seen and typically used on ships that are transiting the Gulf of Aden or the Red Sea and are therefore assessed as at risk from attack by Houthis or pirates,” she added.

After the seizure, White House press secretary Karoline Leavitt rejected Russian demands for special treatment of the Marinera’s crew during her regular briefing Wednesday.

“This was a Venezuelan shadow fleet vessel that had transported sanctioned oil,” Leavitt said.

“The vessel was deemed stateless after flying a false flag, and it had a judicial seizure order. And that’s why the crew will be subject to prosecution.”

Russia’s Foreign Ministry said it was “closely following” the situation, according to the state-run TASS news agency.

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Wiese Bockmann noted that dark fleet crews are often multinational, typically involving a Russian master with Chinese, Indian or Filipino crew members.

“There is a blurring of commercial and military shipping around the dark fleet,” she said. “What we’re seeing now is something that has really only emerged in the last six or seven months.”

European authorities have also begun holding crews accountable, particularly when captains are “facilitating dangerous deceptive shipping practices, such as spoofing and going dark,” she explained.

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“The EU recently sanctioned the captain of a tanker who refused orders from the Estonian navy (Jaguar) to be stopped for inspection last May. And the French charged a captain over his refusal to comply with orders and failure to justify a flag’s nationality after authorities intercepted a dark fleet tanker in the Atlantic last October,” Wiese Bockmann added.

As previously reported by Fox News Digital, a second vessel, the M. Sophia, was also boarded in international waters near the Caribbean while en route to Venezuela.

Fox News Digital has reached out to the White House for comment.

DEVELOPING STORYDEVELOPING STORY,

Secessionist leader took a boat to Berbera and then boarded a plane that flew to Abu Dhabi via Mogadishu, coalition says.

The Saudi Arabia-led coalition in Yemen has announced that the leader of the secessionist Southern Transitional Council (STC) has fled to the United Arab Emirates via Somaliland after skipping planned peace talks in Riyadh.

In a statement on Thursday, the coalition said Aidarous al-Zubaidi “escaped in the dead of night” on Wednesday on board a vessel that departed Aden in Yemen for the port of Berbera in Somaliland.

Al-Zubaidi then boarded a plane along with UAE officers and flew to Somalia’s capital, Mogadishu. “The plane turned off its identification systems over the Gulf of Oman, then turned it back on 10 minutes prior to arrival at Al Reef military airport in Abu Dhabi,” the statement said.

There was no immediate comment from the STC or the UAE.

If confirmed, the move could deepen the feud between Saudi Arabia and the UAE that came to light after the Abu Dhabi-backed STC launched an offensive against the Riyadh-backed Yemeni government troops in December.

The STC – which initially supported Yemen’s internationally recognised government against the Houthi rebels in northern Yemen – is seeking an independent state in southern Yemen. It seized the provinces of Hadramout and Mahra, which border Saudi Arabia, in a campaign that Riyadh described as a red line for its national security.

The Saudi-led coalition responded with air strikes on the Yemeni port of Mukalla on December 30, targeting what it called a UAE-linked weapons shipment, and backed a call by Yemen’s internationally recognised government for Emirati forces to withdraw from the country.

For its part, Abu Dhabi denied that the shipment contained weapons and expressed a commitment to ensure Riyadh’s security. On the same day, it announced an end to what it called its “counterterrorism mission” in Yemen.

Yemeni government troops, backed by Saudi Arabian air attacks, went on to reclaim Hadramout and Mahra, and the STC said on Saturday that it would attend peace talks hosted by Saudi Arabia.

But the coalition said al-Zubaidi was not on board the Yemeni Air flight that took the STC delegation to Riyadh on Wednesday.

It launched strikes on al-Zubaidi’s forces in Yemen’s Dhale governorate, while Yemeni government’s ground forces moved on the STC controlled Aden and seized the presidential palace in the city.

The head of the internationally recognised government’s Presidential Leadership Council, Rashad al-Alimi, has meanwhile announced that al-Zubaidi has been removed from the council for “committing high treason”.

Al-Alimi said he has asked the country’s attorney general to launch an investigation against al-Zubaidi and take legal action.