The Russian-backed administration in Sevastopol said on Wednesday that it had suspended ferry routes around the port city, shortly after the city's governor said a Ukrainian drone attack had been repelled by air defenses.
Writing on Telegram, Sevastopol Governor Mikhail Razvozhaev said that three "objects" had been destroyed, and that there had been no casualties or damage to Russia's Black Sea Fleet, which is based in Sevastopol.
Reuters could not independently verify Razvozhaev's claims immediately.
On Tuesday, an explosion in Dzhankoi, in the north of Crimea, was blamed on a Ukrainian drone strike by local officials.
Sevastopol, along with the rest of the Crimean peninsula, was annexed by Russia in 2014, but is internationally recognised as part of Ukraine.
There was no immediate reaction from Ukraine.
On Tuesday, Russian and Ukrainian officials gave conflicting accounts of what appeared to be a brazen attack on Russian cruise missiles transported by train in the occupied Ukrainian Crimean Peninsula.
A Ukrainian military spokesperson indicated that Kyiv was behind the explosion late Monday that reportedly destroyed multiple Kalibr cruise missiles near the town of Dzhankoi in northern Crimea, while stopping short of directly claiming responsibility.
Natalia Humeniuk, the spokeswoman for Ukraine’s southern operational command, described the strike as a signal to Russia that it should leave the Black Sea peninsula it illegally took from Ukraine in 2014.
Speaking on Ukrainian TV, Humeniuk pointed out Dzhankoi’s importance as a railway junction and said that "right now, the way ahead (for Russian forces in Crimea) is clear — they need to make their way out by rail."
A vague statement by Ukraine’s military intelligence agency on Monday said multiple missiles carried by rail and destined for submarine launch had been destroyed, without saying outright that Ukraine was responsible or what weapon had been used.
However, the agency implied that Kyiv was behind the blast, saying it furthers "the process of Russia’s demilitarization, and prepares the Ukrainian peninsula of Crimea for de-occupation."
Moscow-installed authorities in Crimea on Tuesday provided a different version, saying that Ukrainian drones attacked civilian facilities in Dzhankoi.
Sergei Aksenov, the Kremlin-appointed head of Crimea, said the attack left one civilian wounded, but caused "no serious damage."
Aksenov’s adviser, Oleg Kryuchkov, rejected Ukraine’s claims and said Ukrainian drones had targeted residential areas rather than the railway. Igor Ivin, head of the local administration in Dzhankoi, said the attack damaged power lines, a private house, a store and a college building.
Unconfirmed social media reports late Monday claimed that Russia’s anti-aircraft defenses shot down multiple drones over Crimea. None of the statements could be independently verified.
Throughout the war, reports have surfaced of attacks on Russian military bases and other infrastructure in Crimea, with Ukraine rarely explicitly claiming responsibility but greeting the incidents with jubilation.
In August, powerful explosions rocked a Russian air base in western Crimea, with Ukraine later saying nine warplanes were destroyed. Satellite photos showed at least seven fighter planes had been blown up and others probably damaged.
Ukrainian officials initially steered clear of taking credit, while mocking Russia’s explanation that a careless smoker might have caused ammunition at the Saki base to catch fire and blow up. Unusually, Ukraine’s top military officer weeks later claimed that he had ordered the strikes.
Russian-appointed authorities have also previously reported repeated Ukrainian drone attacks on Crimea, most of which targeted the port of Sevastopol that hosts a major Russian naval base.
These incidents in Crimea, as well as reported drone attacks on Russian territory far from the war’s front lines, have exposed major weaknesses in Moscow’s defenses and embarrassed Russian President Vladimir Putin, who reportedly believed the invasion of Ukraine would be quick and easy.