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Greenpeace reported a large oil slick in the Black Sea following naval drone attacks on tankers off Sochi, prompting Krasnodar Krai to declare a heightened alert over a possible spill near Gelendzhik and Novorossiysk; Russia denies pollution. Oil-covered birds have since washed ashore, prompting a wildlife rehabilitation appeal. Separately, a drone attack sank a ship near Bulgaria's coast, leaving 11 people missing, prompting Sofia to summon the Russian ambassador, with Bulgaria's PM saying the outcome