Air raid sirens sounded in multiple Ukrainian regions Sunday evening as aerial reconnaissance detected several swarms of so-called kamikaze drones launched by the Russian military, Ukrainian media reported.
The air alert applied to the Kharkiv, Poltava, Sumy and Dnipro regions in the east of the country. No further details were initially available.
Earlier, the Ukrainian military had carried out drone attacks in the south of Russia.
In Krasnodar, a drone attack triggered a fire at an oil refinery. According to the Ministry of Defence in Moscow, at least eight drones were shot down over the southern Russian city of Belgorod.
At least one person died when a drone hit Belgorod and 11 others were injured, according to media reports. The information could not be independently verified.
Earlier, Russian officials said that Ukraine launched dozens of drones against Russia, the last day of the Russian elections, including an attack on a polling station in the Russian-occupied region of Zaporizhzhya and others sent to Moscow.
During the assault, the municipal cultural centre in the small town of Kamyanka-Dniprovska caught fire, wrote Russian politician Vladimir Rogov, chairman of the "We are with Russia" movement, on his Telegram channel.
The Ministry of Civil Protection were unable to begin extinguishing the fire as the drone attacks were continuing. There were no casualties.
There was initially no official confirmation of the report about the alleged occupation of an administrative building by Russian paramilitaries fighting alongside Kiev.
The so-called Siberian battalion claimed to have occupied the building in the border town of Gorkovsky in the Belgorod region.
Russia repelled a total of 35 Ukrainian drone attacks overnight, Russia's Ministry of Defence said on Sunday, including 16 in the Krasnodar region in the south of the country alone.
An oil refinery was attacked there. One fire was quickly extinguished and workers were evacuated, but one person died of a heart attack, the Russian state news agency TASS reported.
The amount of damage following the night-time attack was not officially known at first. The authorities merely reported that there was no danger to the city of Slavyansk-na-Kubani, where the oil processing plant is located.
The refinery, which only went into operation in 2013, processes around 4 million cubic metres of oil per year, making it the 30th largest oil processing plant in Russia.
Several Ukrainian media outlets, citing unnamed sources, reported that the Ukrainian secret service SBU was responsible for the attack together with special Ukrainian army units.
In the western Russian region of Belgorod, which borders Ukraine, a 16-year-old girl was also killed when a rocket hit a residential building, Russian authorities said.
The military said it shot down drones in Belgorod, which was targeted for the third day in a row. Other locations where drones were shot down included Yaroslavl, Kaluga, Kursk, Oryol and Rostov regions. The air defence system also fired several missiles over Belgorod.
In Belgorod, about a dozen residential areas were left without power due to the attack, according to the regional governor, Vyacheslav Gladkov. Buildings and gas pipelines were damaged. A ballistic missile was fired over the Bryansk region.
In Moscow, two drones targeted the Domodedovo district, where the capital's airport is located, Mayor Sergei Sobyanin wrote on his Telegram channel. One drone was repelled in the Ramenskoye district and another in the Stupino district. No injuries or damage were reported.
Russia's Ministry of Defence said on Sunday that Russian troops recaptured the village of Myrne in the southern Ukrainian region of Zaporizhzhya. There was initially no comment on the Russian claim from the Ukrainian side.
The village has long been marked as contested on maps by Ukrainian military observers.
The front line between Ukrainian and Russian troops around the village has shifted several times since Russia launched its full-scale military invasion more than two years ago.
Russian troops captured the village in May 2022, and the Ukrainian military was able to liberate it again in early 2023.
More than 400 inhabitants lived in Myrne before the war.
Ukraine also reported several strikes on its own territory, but Ukraine's air defences said they were able to intercept 14 of the 16 drones, but probably none of the seven missiles.
In recent weeks, Ukraine has increasingly targeted Russian factories and facilities with drones in order to disrupt supplies for the attacking troops.