VIENNA (Reuters) - The Russian-held Zaporizhzhia nuclear power plant in Ukraine could come back online within months of a ceasefire, but it would probably take more than a year to restart all six reactors, the U.N. atomic watchdog chief said on Wednesday.

Ukraine accused Moscow on Wednesday of being incapable of managing safety at the Russian-occupied Zaporizhzhia nuclear power plant after what it said were reports of a huge spillage of diesel, reports dismissed by Russia as "fake".