Ukraine’s general staff said Thursday Russian attacks targeted large areas of the country with heavy shelling, damaging infrastructure and energy supplies to the Zaporizhzhia nuclear power plant, Europe’s largest.

The plant in southern Ukraine has been disconnected, officials said, with damage to high voltage lines leaving it reliant on diesel generators, Ukrainian generation company Energoatom said.

On Thursday, the G-7 group of democratic countries will meet in the western German city of Muenster for two days to discuss how to best coordinate and continue providing support for Ukraine. The meeting comes as the new Russian attacks on energy infrastructure cause widespread power cuts, according to reports.