A thousand km north, on the Gulf of Finland, at least 10 Ukrainian drones were downed over the port of Ust-Luga in Russia's northern Leningrad region, with debris sparking fire at the Novatek-operated terminal - a huge Baltic Sea fuel export terminal and processing complex, the regional governor said.

Russia accused Ukraine on Sunday of launching drone attacks that sparked a fire at a nuclear power plant in its western Kursk region overnight, as Ukraine celebrated 34 years since its independence.

Russia on Sunday accused Ukraine of launching a wave of drone strikes, including one that set off a fire at a nuclear power plant, as Kyiv marked 34 years of independence from the Soviet Union.