OilPrice.com has published an investigation into what it describes as a Russian-Iranian system for moving sanctioned oil to market — a pipeline of tankers, intermediaries and paperwork that keeps barrels flowing despite US and allied restrictions.

The report focuses on how crude and refined products tied to both countries pass through overlapping channels: reflagged vessels, ownership chains buried across jurisdictions, and destination changes made at sea. The title itself frames the mechanism as a laundering machine spanning military and energy interests on both sides.

Why does this matter to refiners and traders?

Sanction-evasion networks change where supply actually sits. A cargo labeled as one origin can be another, and a vessel that appears compliant on paper may not be. For anyone buying freight or crude on the water, that gap between the manifest and the molecule is the operational risk.

The report sits within a broader pattern of coverage since the G7 price cap and successive OFAC designations tightened scrutiny on Russian crude, and as Iranian exports have continued to move, largely to Asian buyers, through similar dark-fleet logistics.

The takeaway: supply from both countries keeps reaching market, but through channels that raise legal and reputational exposure for counterparties anywhere along the chain.

The watch item is enforcement — the next OFAC designation round and how aggressively ports and insurers police vessel ownership.