In Ukraine, the Russian-occupied Zaporizhzhia nuclear power station began using one of its own reactors to power critical cooling systems Monday after heavy fighting between Russian and Ukrainian forces destroyed electrical lines leading to the plant. It’s the second time in the last two weeks Europe’s largest nuclear power plant has been forced to turn to emergency backup power to prevent a nuclear catastrophe. Ukraine’s President Volodymyr Zelensky accused Russia of using the power plant as a “nuclear weapon.” Today the head of the International Atomic Energy Agency, Rafael Grossi, will brief the U.N. Security Council on his agency’s findings after a team of IAEA inspectors reached Zaporizhzhia last week.

Elsewhere, Ukrainian officials say Russian rocket attacks killed three civilians in Kharkiv, while in the south, officials in the Russian-occupied city of Kherson have postponed a voter referendum on whether to join Russia, as Ukraine presses a counteroffensive to retake the region.