Russia's largest Black Sea oil export terminal has effectively gone offline just days after drone attacks shut down the neighboring Caspian Pipeline Consortium terminal, tightening another artery that moves crude onto the global market. Together they form one of the most important oil export hubs on the Black Sea. Ukraine has expanded drone attacks beyond refineries and storage facilities to commercial shipping and export infrastructure in the Black Sea and Sea of Azov. Russia has responded by warning vessels operating in its Black Sea economic zone that navigation is no longer considered safe because of the threat from air and sea drones. Now the Black Sea is becoming another source of lost barrels instead of replacement supply.