Blending Russian and Iranian crude is logistically impractical, despite persistent market rumours, according to a report by The Maritime Executive.

The claim has circulated among traders and shipping watchers for months. The premise is simple: mix Russian export barrels with Iranian cargoes to disguise origin and ease sanctions exposure. The report's finding is equally simple: the physical infrastructure does not support it.

Why can the two streams not be blended?

Oil blending is a physical operation. It requires co-located storage, compatible tanker scheduling and sufficient shore-tank capacity at a shared terminal. Blending at sea, using ship-to-ship transfer, is possible in principle but adds time, cost and detection risk.

The Maritime Executive's assessment finds the required conditions absent. Russian export logistics and Iranian export logistics run through separate terminals, separate tanker fleets and separate discharge markets. That separation, not intent, is what rules out large-scale blending.

The report frames the rumours as persistent but unsupported by operational evidence. No terminal, operator or cargo was named as a confirmed blending site.

What does this mean for sanctions watchers?

The blending narrative matters because it touches two sanctioned supply chains at once. Russian crude exports sit under a G7 price cap. Iranian exports sit under US sanctions. A blended barrel would complicate attribution for insurers, refiners and compliance teams.

The report's conclusion narrows that risk. Without shared storage or overlapping tanker routes, blended barrels cannot move at meaningful volumes. Compliance desks can treat the rumour as noise rather than a new evasion channel.

Takeaway: infrastructure, not policy, is the binding constraint on this rumour.

What should readers watch next?

Watch terminal-level data. Any confirmed co-location of Russian and Iranian barrels at a single storage site would change the assessment. So would a documented ship-to-ship transfer pairing a sanctioned Russian tanker with an Iranian-flagged vessel carrying both grades.

Neither signal has appeared, per The Maritime Executive. Until one does, the blending story remains speculation without a logistical base.