Kyiv has lodged a legal brief with the International Maritime Organization, asserting that its naval strikes on vessels tied to Russia’s shadow fleet comply with international law. The move follows a Russian communiqué labeling the attacks as ‘terrorism’ and demanding punitive measures. Ukraine argues the ships transport military cargoes that directly support Moscow’s war effort.

By classifying the fleet as a civilian‑only convoy, Russia seeks to shield assets from retaliation and preserve shipping revenues that fund its defense budget. Kyiv counters that many of the flagged vessels operate under opaque ownership and have been repeatedly used to move arms, ammunition and fuel. The dispute could trigger broader sanctions on ship owners and insurers. London brokers warn rating downgrades.

International insurers are watching the legal argument closely, as any ruling that legitimises strikes could raise war‑risk premiums on vessels traversing the Black Sea. Traders fear disruptions to oil and grain shipments, which already face volatility from sanctions and port closures. The outcome will shape how maritime law is applied in modern conflicts, influencing both shipping costs and geopolitical risk assessments.