What actions did Greenpeace take against the abandoned Russian shadow fleet tanker Kairos off Bulgaria, what evidence of oil pollution has the organization presented, how have Bulgarian authorities responded, and what is the background of the Kairos, including its EU/UK sanctions

Evidence of Oil Pollution

Greenpeace presented two layers of evidence:

• Satellite imagery analysis: Greenpeace Bulgaria identified dozens of oil slicks recorded near the Kairos between late April and late July 2026, arguing they formed a recurring pollution pattern linked to the damaged tanker .
• On-water leak documentation: The Arctic Sunrise team documented a visible leak from the Kairos days before the hull-marking protest .

Independent reports also noted fuel oil pollution appearing on Bulgarian Black Sea beaches between Rezovo, Sinemorets, Lozenets, Arkutino and Kamchia in June 2026, though authorities attributed that to older deposits disturbed by rough seas rather than the Kairos .

Bulgarian Authorities' Response

The Bulgarian response has been mixed and partly disputed:

• Initial denial (July 27, 2026): Officials denied that a persistent oil slick was coming from the Kairos, pushing back against Greenpeace's satellite findings .
• Inspection ordered (late July 2026): After citizen complaints about possible maritime pollution near Pomorie and Burgas, Bulgaria's Maritime Administration ordered an inspection of the waters around the Kairos and sent patrol boats to investigate .
• Official investigation: The Ministry of Transport called for investigation teams to examine a possible leak from the sanctioned tanker .
• Cost recovery action (January 2026): Bulgaria's Maritime Administration presented a bill to the Chinese-linked owners of the Kairos seeking reimbursement for the salvage operation after it grounded near Ahtopol in December 2025 .

Background of the Kairos

Sanctions Status

The Kairos was a Gambian-flagged oil tanker identified as part of Russia's "shadow fleet" — vessels used to evade the G7 price cap and EU/UK oil embargo on Russian crude . It was sanctioned by the EU and UK, meaning it was barred from EU ports and denied a broad range of maritime services . OpenSanctions records show the tanker had been involved in exporting Russian oil to third countries since November 2023 in violation of the embargo .

November 2025 Ukrainian Drone Strike

On November 28, 2025, Ukraine's Security Service (SBU) struck two Russian shadow fleet tankers — the Kairos and the Virat — using Sea Baby naval drones in the Black Sea, approximately 28 nautical miles off the Turkish coast . The Kairos was empty (in ballast) at the time of the attack but sustained significant damage. Ukraine described the operation as part of its campaign to undermine Russia's oil revenues .

Grounding and Relocation

• December 5, 2025: After the drone strike, a Turkish tugboat was towing the stricken Kairos when the towline broke in rough weather. The tanker drifted aground near the Bulgarian coastal town of Ahtopol .
• December 6–8, 2025: Bulgarian maritime authorities, border police, and navy launched a rescue operation. The crew was evacuated by helicopter .
• Mid-December 2025: Bulgaria successfully towed the Kairos off the shoreline and relocated it to Burgas Bay, where it has been anchored (essentially abandoned) for over six months .

Ownership

The Kairos was reported to be Chinese-owned, though operated as part of Russia's shadow fleet . Bulgaria sought reimbursement from its owners for the salvage costs.

Broader Context

Black Sea Maritime Security Threats

The Kairos incident is part of a much larger pattern:

• Ukrainian drone campaign: Ukraine has systematically targeted Russian shadow fleet vessels. In November 2025 it struck the Kairos and Virat with Sea Baby drones and also hit the Caspian Pipeline Consortium terminal at Novorossiysk .
• Operation MoLoChKa (launched July 6, 2026): Ukraine escalated with a dedicated military campaign using naval and aerial drones against Russian shadow fleet tankers in the Sea of Azov and Black Sea, claiming 218 vessels struck as of mid-July 2026 .
• Western interdiction: The UK seized the shadow fleet tanker Smyrtos in the English Channel in August 2026, prompting Putin to threaten retaliation against Western commercial ships . The US began a campaign to seize Russian-linked shadow fleet vessels on January 7, 2026 .

Russia's Arctic Oil Convoy Operations

In parallel, Russia has dramatically expanded its use of the Northern Sea Route (NSR) to bypass Western interdiction:

• In August 2026, Russia assembled an unprecedented convoy of eight sanctioned shadow fleet tankers to transit the Northern Sea Route — a scale with no recorded precedent .
• A fleet of roughly a dozen to fifteen tankers is carrying nearly 8 million barrels of crude oil through the Arctic to Asian markets, representing about 60% of all oil delivered via the NSR during the entire summer-autumn navigation season .
• This Arctic route allows Russia to avoid the English Channel, the Mediterranean chokepoints, and the Black Sea — all areas where interception and sanctions enforcement are concentrated.

Sanctions Scale

As of July 2026, the EU had sanctioned 671 shadow fleet vessels (up from just 25 in July 2024). The UK and US have imposed similar numbers, collectively blacklisting hundreds of tankers . However, enforcement remains uneven — 135 sanctioned tankers were observed loading at Russian ports even after being designated .