Kyiv has said its strikes are in response to Russia's attacks on Ukraine and are aimed at destroying infrastructure deemed crucial to Moscow's military efforts.

Russia launched drones and a missile into Ukraine overnight into Sunday, the air force in Kyiv said, as the country kicked off independence day celebrations marking the anniversary of its 1991 declaration of independence from the Soviet Union.

A fire erupted in Russia's Kursk Nuclear Power Plant on Sunday after Ukraine launched a drone attack at one of Russia's biggest nuclear power plants, damaging a transformer and causing a fall in the output of one of its reactors by 50 per cent,