Ukraine has significantly escalated its strategy to disrupt Russia's oil sales, which fund its war, by increasingly targeting "shadow fleet" vessels with SBU naval drones.Attacks recently involved tankers like Kairos, Virat, and Mersin in international waters, including off Turkey, Bulgaria, and West Africa, prompting a Turkish shipping operator to halt Russia-related voyages.This shift expands Ukraine's rules of engagement to include civilian oil tankers, moving beyond its previous policy of sparing such vessels, a change that follows Oleksandr Kubrakov's decision last year to decline targeting a civilian tanker.