A series of explosions have rocked Crimea, after a reported Ukrainian drone attack on the peninsula which was annexed by Russia in 2014.
Video posted online shows a blast allegedly near a fuel depot in the south-eastern city of Feodosiya.
Russian officials said 38 drones had been shot down. The Kerch bridge which connects Crimea with Russia was temporarily closed.
The attack comes as Ukraine continues to urge allies to boost arms supplies.
Russian troops have recently made gains in Ukraine as Kyiv struggles to sustain its forces with Western-made arms. Moscow took control last month of the key eastern town of Avdiivka.
Russia has not reported any damage from the latest attack on Crimea, although eye-witness have reported windows shaking and car alarms going off. Kyiv has not confirmed its forces were involved.
The Crimea attack comes a day after a Russian drone hit a block of flats in the Ukrainian city of Odesa, killing at least 10 people, including a four-month-old baby.
Russian forces have launched thousands of Iranian-made drones at Ukrainian targets since they invaded the country more than two years ago.
In retaliation Ukraine has targeted Russian sites, notably oil facilities.
On Saturday a drone struck a residential building in St Petersburg, Russia's second-largest city. About 100 people were evacuated and there were no reports of casualties.
Ukraine is critically dependent on weapons supplies from the US and other Western allies to keep fighting Russia - a much bigger military force with an abundance of arms and artillery.
Ukrainian troops have been running out of ammunition as supporters of former US President Donald Trump in Congress refuse to approve a $61bn (£48bn) military aid package.
