Black Sea oil slick after tanker attack; Russia declares alert, denies pollution

Greenpeace reports a large oil slick in the Black Sea following a naval drone attack on a tanker off Sochi, prompting Krasnodar Krai to declare a heightened alert for a possible petroleum spill. Russia denies any pollution, but the governor's order cites drone attacks causing accidents and a risk of emergency near Gelendzhik and Novorossiysk. The incident underscores ongoing maritime conflict in the region and potential environmental fallout.