Sanctions — 2026-08-12

Sanctioned Russian Shadow Fleet Tanker Leaks Oil Off Oman After Mystery Explosion Creating 600 Square Kilometer Slick

BLUFOman's forced absorption of cleanup costs for an uninsured, unflagged sanctions-evasion tanker exposes a structural gap that coastal states along shadow fleet routes will face repeatedly.

The sanctioned tanker Caroline Bezengi, Cameroon-flagged and carrying roughly 800,000 barrels of oil, departed Novorossiysk in April and ran aground in Oman's Al Hallaniyat archipelago in June following onboard explosions of undetermined cause; maritime security sources cited by Reuters said an explosion is believed to have occurred, and Greenpeace has cited reports of a suspected limpet mine attack that flooded the engine room 12. Greenpeace Germany satellite analysis found the slick grew from 45 square kilometers on July 26 to about 150 square kilometers by August 2, then quadrupled to roughly 600 square kilometers by August 4 23. Oman's Environment Authority, disclosing the leak for the first time on Monday, put the slick at approximately 390 square kilometers located about 7 kilometers from shore 1. The vessel lost its Cameroon flag registration on May 29 and is now listed "flag unknown" by the IMO. Its Shanghai-based owner, Rentoor Shipmanagement, has not responded to Omani orders to act, and Greenpeace could not confirm whether the tanker's sole listed insurer, Kyrgyzstan-based Arsenal Kyrgystan, remains valid 2.

Analysis
The tanker's murky ownership and unverified insurance leave Oman to absorb containment costs alone, with no flag state or P&I club obligated to fund cleanup as the slick threatens coral reefs, seagrass meadows, and humpback whale habitat inside a protected marine area. Rentoor Shipmanagement's silence strips Omani authorities of legal leverage, forcing a choice between unilateral intervention and seeking international assistance. Sourcing rests substantially on Greenpeace's satellite analysis, with Meduza and The Insider amplifying rather than independently corroborating; Oman's Environment Authority only confirmed the leak publicly this week, weeks after Greenpeace first flagged the accelerating spill. The explosion may just as plausibly reflect mechanical failure in an aging, poorly maintained vessel as the suspected limpet mine attack Greenpeace has cited, since no party has confirmed deliberate sabotage. The episode extends a pattern of sanctions-evasion vessels operating outside the accountability structures flag states and insurers were built to provide.

3 sources

Sanctioned Russian tanker leaks oil off Oman after mystery explosion - Meduza
Oil disaster unfolds in protected marine area as Russian shadow fleet tanker leak accelerates off Oman - Greenpeace International
Oil slick from Russian "shadow fleet" tanker off Oman grows to 600 square kilometers, Greenpeace says - The Insider