Ukraine launched a drone attack on Russia on Sunday, forcing a sharp fall in the capacity of a reactor at one of Russia's biggest nuclear power plants and sparking a huge blaze at the major Ust-Luga fuel export terminal, Russian officials said.

Despite talk of peace by Russia and Ukraine, the deadliest European war since World War Two is continuing along the 2,000 km (1,250 mile) front line accompanied by missile and drone attacks deep into both Russia and Ukraine.

Russia's defence ministry said at least 95 Ukrainian drones had been intercepted across more than a dozen Russian regions on August 24, the day that Ukraine celebrates its declaration of independence from the Soviet Union in 1991.

The Kursk nuclear power plant, just 60 km (38 miles) from the border with Ukraine, said that air defences shot down a drone that detonated near the plant just after midnight, damaging an auxiliary transformer and forcing a 50% reduction in the operating capacity at reactor No. 3.

Radiation levels were normal and there were no injuries from the fire which the drone sparked, the plant said. Two other reactors are operating without power generation and one is undergoing scheduled repairs.

The United Nations' nuclear agency, the International Atomic Energy Agency, said it was aware of reports that a transformer at the plant caught fire due to military activity and stressed that every nuclear facility should be protected at all times.

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.

PLUME OF BLACK SMOKE

Unverified footage on Russian Telegram channels showed a drone flying directly into a fuel terminal, followed by a huge ball of fire rising high into the sky followed by a plume of black smoke billowing into the horizon.

"Firefighters and emergency services are currently working to extinguish the blaze," Alexander Drozdenko, governor of Russia's Leningrad region, said. There were no injuries, he added.

According to Novatek (NVTK.MM), the Ust-Luga complex, which opened in 2013, processes gas condensate into light and heavy naphtha, jet fuel, fuel oil and gasoil, and enables the company to ship oil products as well as gas condensate to international markets.

Novatek produces mostly naphtha for Asia, including China, Singapore, Taiwan and Malaysia, as well as jet fuel with delivery to Istanbul.

Rosaviatsia, Russia's civil aviation authority, said flights were halted for hours on end at several Russian airports overnight, including at the Pulkovo airport in the Leningrad region.

Ukrainian drones also attacked an industrial enterprise in the southern Russian city of Syzran, the governor of the Samara region said on Sunday. A child was injured in the attack, according to the governor, who did not specify exactly what had been attacked.

Earlier this month, the Ukrainian military said it had struck the Syzran oil refinery. The Rosneft-owned (ROSN.MM) refinery was forced to suspend production and crude intake after the attack, sources told Reuters.

There was no immediate comment from Ukraine. Kyiv has said its strikes inside Russia are in response to Russia's continued attacks on Ukraine and are aimed at destroying infrastructure deemed crucial to Moscow's overall military efforts.