A Ukrainian drone attack ignited a fire at an industrial site late Friday in Russia's Kaluga region, about 170 kilometers from the shared border.
"As a result of a drone attack in Lyudinovo, a fire broke out on the territory of an industrial enterprise," regional Governor Vladislav Shapsha posted on Telegram.
Agence France-Presse reported that unverified videos on unofficial Russia social media showed what they said was the attack targeting an oil depot.
A Russian missile attack killed at least four people and injured at 14 others in the southern-central Ukrainian city of Kryvyi Rih on Friday, Ukrainian President Volodymyr Zelenskyy said in his daily address.
"Such strikes, such losses, simply would not have happened if we had received all the necessary air defense systems that we have been talking about with our partners for such a long time and that are available in the world," the president said.
Earlier Friday, Zelenskyy, who was born in Kryvyi Rih, condemned the attack on Telegram. "Each such terrorist attack is another reminder of who we are dealing with. Russia will not stop on its own — it can only be stopped by joint pressure," he said.
The attack also damaged an educational facility and two five-story buildings, officials said.
VOA was unable to independently verify the reports.
On Friday, Russia's Defense Ministry said that Ukraine on Thursday had launched an attack on Russia's Belgorod region with six U.S.-made ATACMS missiles.
The ministry said all the missiles had been intercepted but that Russia would nonetheless retaliate.
The Kremlin has said it will respond every time Ukraine uses ATACMS or British Storm Shadow cruise missiles to attack Russia.
Kyiv first used those weapons to strike Russia in November after Washington and London gave Ukraine permission to do so.
Speaking at a news conference in Berlin, German Chancellor Olah Scholz said Friday that he does not expect the United States to halt military aid to Ukraine after U.S. President-elect Donald Trump is inaugurated on January 20.
"We can therefore hope that good cooperation between Europe and the USA will continue to be successful in the future, including on the issue of support for Ukraine," Scholz said. "I don't expect the U.S. to stop supporting Ukraine in its defense."
Trump has previously said he would be able to stop the war in Ukraine in one day, but he has not specified how he would do so.
Trump aides recently said the new plan is to end the war within the first 100 days of the administration.
Some information in this report came from Reuters and Agence France-Presse.
