Ukraine says it has struck Russian naval targets and port infrastructure in the Crimean city of Sevastopol in what appears to be the biggest attack of the war on the home of the Russian Black Sea Fleet.
The attack on Crimea, which was seized and annexed by Russia in 2014, was confirmed by Moscow.
It highlighted Kyiv's growing missile capabilities as Russia continues to bombard Ukraine from afar with long-range missiles and assault drones.
"We confirm a large landing vessel and submarine were hit," Ukrainian military intelligence official Andriy Yusov told Reuters, giving no further details on the scale of the damage.
"We do not comment on the means (used) for the strike."
Russia's defence ministry said in a statement Ukraine had attacked a Black Sea shipyard with 10 cruise missiles and three uncrewed speedboats in the early hours of Wednesday, damaging two vessels that had been undergoing repairs.
It said it downed seven of the incoming missiles and that the attack boats had been destroyed by a Russian patrol ship.
"It really is the biggest attack on Sevastopol since the beginning of the war," retired Ukrainian navy captain Andriy Ryzhenko told Reuters by telephone.
It was not clear what kind of missile was used by Kyiv in the attack on Sevastopol, which lies about 300km from Ukraine's Black Sea port of Odesa.
The West has poured weapons worth billions of dollars into Ukraine to help it fend off Russian forces that have occupied swathes of territory in the south and east since their full-scale invasion in February 2022.
The Ukrainian military, which launched a counteroffensive in early June, took the unusual step of publicly claiming responsibility for the strike, something it does not typically do for attacks on Russia or the Crimea peninsula.
"On the morning of September 13 the Ukrainian armed forces conducted successful strikes on naval assets and port infrastructure of the occupiers at the docks of temporarily occupied Sevastopol," it said on Telegram.
Mikhail Razvozhayev, the Moscow-installed governor of Sevastopol, the largest city in Crimea and a major Black Sea port, said on Telegram at least 24 people had been injured.
He posted a night photo of flames engulfing what appeared to be port infrastructure.
Russian Telegram channels posted videos and more photos of flames at a facility by the water.
"All emergency services are working on the site, there is no danger to civilian objects in the city," he said.
The shipyard on the peninsula builds and repairs ships and submarines of the Russian Black Sea Fleet.
The fleet has launched numerous missile attacks on Ukraine throughout the war.
