Russia's military claims it has shot down a drone near the Sevastapol port which hosts its Black Sea fleet.
Sevastopol Governor Mikhail Razvozhaev said on Telegram that a Russian ship "shot down a UAV over the sea" on Thursday morning.
Russia's Black Sea fleet was targeted in October in what authorities described as a "massive" drone attack, which damaged one ship and led Moscow to briefly withdraw from the UN-brokered grain deal.
On Thursday, Kremlin spokesman Dmitry Peskov claimed "there are risks" of Ukrainian attacks in Crimea, which was annexed by Russia in 2014.
But Peskov said the fact the drone was shot down "shows that effective countermeasures are being taken".
The region has reportedly been hit by several drone strikes in recent months, including one that destroyed a military airfield in August.
The Kerch bridge, which connects the peninsula to the Russian mainland, was also damaged by an explosion that Moscow has blamed on Ukrainian military intelligence.
"There are risks because the Ukrainian side continues to follow its line of organising terrorist attacks," Kremlin spokesman Dmitry Peskov said on Thursday.
Russian President Vladimir Putin visited the reconstructed bridge this week for the first time since the invasion of Ukraine began in February.
After Ukrainian forces recaptured the southern city of Kherson, Moscow said it was carrying out "fortification work" on the peninsula to "ensure the safety of Crimeans".
Peskov told reporters that "effective measures" were being taken in Crimea, without giving further details.
Deadly explosions have been reported at Russian airbases, located hundreds of kilometres from the Ukrainian border. Moscow blamed Ukraine, which didn’t claim responsibility.
The Kremlin said on
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