Ukraine's power system has been significantly damaged by a campaign of Russian bombardment. Photo: EPA PHOTO

Ukraine's anti-corruption bureau has announced a vast investigation into the country's energy sector, alleging a $US100 million ($A153 million) kickback scheme involving the state nuclear power company.

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The bureau, a state agency that operates independently of the government, made the announcement as Ukraine braces for winter with its power sector under frequent fire by Russia and regularly facing power outages.

The agency alleged on social media that behind the scheme was a

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