Ukraine’s naval drones targeted the city of Novorossiysk that hosts a key naval base for Russia’s Black Sea fleet on Thursday.

The Russian Ministry of Defense said its military destroyed two of the sea drones “in the north-eastern part of the Black Sea.”

The city’s mayor Andrey Kravchenko told residents near the coastline not to approach windows and to stay away from open spaces.

Russia has relocated much of its prized Black Sea fleet from Sevastopol in Crimea to ports in Novorossiysk and Feodosia amid the threat of Ukrainian strikes on its vessels.

Ukraine has ramped up its attacks on Russia’s ships using its Magura V5 maritime drones in recent months.

In May, Ukraine’s Main Intelligence Directorate said they had caused $500 million worth of damage to Russia’s naval vessels throughout the war.

The Magura V5 drone is the “main and best weapon available to Ukraine” to target the Black Sea fleet, HUR spokesperson Andriy Yusov said.

This is a breaking story. More to follow.