Russian forces have taken control over the city of Energodar where Europe’s biggest nuclear power plant is located, the Russian Defence Ministry said.
According to the ministry, the earlier fire at the plant was the result of a provocation by Kiev aimed at accusing Russia of creating a hotbed of radioactive contamination.
But Ukraine had accused Russian forces of attacking the Zaporizhzhya nuclear power plant.
Fears of a potential nuclear disaster at the Zaporizhzhia plant had spread alarm across world capitals, before authorities said the fire in a building identified as a training centre, had been extinguished.
Russia had already captured the defunct Chernobyl plant north of Kyiv, which spewed radioactive waste over much of Europe when it melted down in 1986.
The Zaporizhzhia plant is a different and safer type, analysts said.