Russian officials said a Liberian-flagged tanker was attacked and a crew of 23 Indian nationals rescued

An oil tanker off Russia’s Black Sea coast was struck by a naval drone, triggering a huge fire and black smoke cloud that blanketed parts of the resort city of Sochi, Russia’s transport ministry has said.

The transport ministry said a Liberian-flagged tanker had been attacked and that “crude oil is burning openly in the waters of the Black Sea”.