A Russian drone attack in the Bay of Sevastopol, where the Black Sea Fleet is headquartered.

Russian naval forces repelled a drone attack in the Bay of Sevastopol, where the Black Sea Fleet in headquartered, on the annexed Crimean peninsular, the Russian-installed leader of the area said on Saturday.

"Ships of the Black Sea Fleet repelled a drone attack in the waters of the Sevastopol Bay," the governor of Sevastopol, Mikhail Razvozhaev, said on Telegram.

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"Nothing has been hit in the city. We remain calm. The situation is under control."

Local officials said ferries and boats had temporarily stopped crossing the Bay of Sevastopol.

Plumes of smoke billow into the sky after a drone attacks a thermal power station near Sevastopol.

Sevastopol is the largest city in Crimea, which Russia annexed from Ukraine in 2014.

Crimea was annexed into the Russian empire in the 18th century and was later a part of Russia within the Soviet Union until 1954, when it was handed to the Soviet Republic of Ukraine by Nikita Khrushchev.

According to another reports Russia annexed the Crimea peninsula from Ukraine in 2014.

Its forces attacked Ukraine from several directions in February this year, including from Crimea.

Earlier this week, Razvozhayev said that a drone had attacked a thermal power station near Sevastopol.

The Russian fleet stationed in the port had also been attacked by a drone in July.

The latest announcement came as Ukrainian forces press a counter-offensive to retake land in the country's Russian-occupied south.