It was not possible to independently verify the claim.

The Defence Ministry also reported that 17 Ukrainian drones and other projectiles were shot down over the Russian border regions of Belgorod, Kursk and Bryansk.

Russia launched its full-scale invasion of Ukraine more than two years ago. Kyiv has received massive Western support, including military aid, for its defensive campaign. The US is the country's most important backer in that regard.

US Secretary of State Antony Blinken travelled to Kyiv for a surprise visit on Tuesday, where he met President Volodymyr Zelensky. He is set to meet with Ukrainian Foreign Minister Dmytro Kuleba on Wednesday.

According to Ukrainian media reports, Blinken promised Ukraine weapons aid that could change the situation on the battlefield.

Russia began a major attack on Ukraine's second city of Kharkiv, in the northeast, and the surrounding region four days ago. Moscow's forces have captured several villages and continue to bombard Kharkiv with missiles.

Russian border regions have repeatedly come under fire from Ukraine over the course of the war. Crimea, which was illegally annexed by Moscow in 2014, has also been the target of Ukrainian attacks.