A drone attack on Saturday on Russian Black Sea fleet installations in the Moscow-annexed Crimea was the most "massive" of the conflict in Ukraine, the Russian-installed governor of the city of Sevastopol said.
"The most massive attack by drones and remotely piloted surface vehicles on the waters of the Bay of Sevastopol in the history of the conflict took place last night," Mikhail Razvojaev was quoted as saying by the TASS agency.
Russia has blamed Ukraine for the attack, AFP reports.
Earlier, Razvojaev said the Russian navy had repelled a drone attack against the Black Sea Fleet, saying no facilities had been hit and the situation was under control. All the drones involved in the attack had been "shot down", Razvojaev added on Telegram.
The port of Sevastopol was "temporarily" closed to ships and ferries after the attack, the city's authorities said later.
The reported new drone attack in Sevastopol comes as Ukrainian forces have launched a counter-offensive to regain ground in the south of the country.
On Thursday, Razvojaev said the Balaklava thermal power plant had been targeted by a drone attack.
Russia, which launched an offensive in Ukraine on 24 February, annexed Ukraine's southern Crimean peninsula in 2014.
Russia said on Saturday that the accelerated deployment of modernised US B61 tactical nuclear weapons at NATO bases in Europe would lower the "nuclear threshold" and that Moscow would take the move into account in its military planning.
The United States told a closed NATO meeting this month that it would accelerate the deployment of modernised weapons arriving at European bases several months earlier than planned, according to Politico.
Its report said that an upgraded version of the B61, the B61-12, would be
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