Ukraine has released video footage of a large-scale drone operation that struck 20 Russian vessels in the Black Sea, escalating its campaign against Moscow's maritime assets. The attack targeted 17 oil tankers, two gas tankers, and a tugboat, according to Kyiv officials. Main Developments Over the past 10 days, Ukraine claims to have struck 136 ships linked to Russia's shadow fleet across both the Black and Azov seas. The latest operation, documented in released video, demonstrates Kyiv's growing ability to disrupt Russian naval logistics far from its coastline. These drone strikes mark a significant tactical shift, moving from defensive coastal operations to offensive interdiction of commercial and military shipping. The vessels hit include tankers crucial for Russia's oil exports and military resupply routes. Read also: US-Iraq Ties: From War to Economic Diplomacy Background Russia's shadow fleet — aging, poorly insured tankers — has been used to evade Western sanctions on oil exports since the full-scale invasion began in 2022. The Azov Sea corridor became a critical artery after Ukraine targeted the Kerch Strait bridge and Black Sea ports. Ukraine's unmanned surface vessels (USVs) have evolved from experimental prototypes into a core naval weapon, compensating for the country's lack of a traditional navy. Previous strikes sank or damaged several Russian warships, including the Moskva cruiser in 2022. Why It Matters Disrupting Russia's shadow fleet directly threatens Moscow's ability to finance its war effort. Oil revenues account for roughly a third of Russia's federal budget, and each tanker hit forces rerouting, insurance hikes, or outright loss of cargo. The strikes also challenge Russia's de facto blockade of Ukrainian ports, potentially reopening grain export routes that feed global markets. For NATO allies, Ukraine's drone program offers a low-cost template for countering larger naval forces. What's Next Ukraine has signaled it will continue targeting shadow fleet vessels, with no announced pause in operations. Russia may respond by reinforcing naval patrols in the Azov Sea or moving tanker routes closer to its own coast. Diplomatic efforts to tighten sanctions on the shadow fleet face resistance from some importers, while insurers are already raising premiums for Black Sea voyages. The coming weeks will test whether drone swarms can sustain this pace of interdiction without significant losses.