Clandestine ship-to-ship (STS) operations in waters off Malaysia have more than doubled in recent weeks, according to analysis based on available satellite imagery and AIS data. Maritime observers have identified a significant increase in the number of STS pairs involved in cargo movements, sometimes under opaque flags or identities, suggesting increased activity from what is known as the “dark fleet.”

These transfers, often linked to oil cargoes or derived products, pose major challenges for regulatory compliance, maritime safety, and the traceability of international trade flows. Experts emphasize that such operations can involve increased risks of collisions, accidental spills, and circumvention of sanctions regimes, with implications for insurers, ship operators, and regulators.

The increase in these activities also highlights the need for strengthened surveillance protocols, more rigorous crew verification, as well as closer international coordination to combat undeclared movements that can destabilize established trade routes.

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