Moscow: Adding that there was no damage or casualties, Russian authorities said on Monday that they had "repelled" a drone attack on the Crimean port of Sevastopol, which Moscow has annexed.

Since the Kremlin's special military operation in Ukraine in February of last year, the peninsula, which Russia annexed from Ukraine in 2014 and now serves as the base for its Black Sea Fleet, has been subjected to a number of drone attacks.

The Russian-installed governor Mikhail Razvozhayev posted on Telegram that "an attempted attack on Sevastopol was repelled from 3:30 a.m.," adding that one unmanned surface vehicle, or drone ship, was destroyed and another exploded.

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The city is serene overall. However, all of the forces and services are prepared for battle.

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Russia's Black Sea Fleet was the target of a significant drone attack in October, which the Kremlin attributed to Ukraine.

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Russian authorities declared in mid-April that there would be no celebrations in Sevastopol on May 1 and 9 (the dates of the end of WWII in Russia) due to "security problems."