"Zaporizhzhia, one of the four regions Russia has annexed and claimed as a part of the Russian Federation, is at the heart of Ukraine’s strategy for its much-touted spring counteroffensive. The rationale for focusing on Zaporizhzhia is clear enough: It lies on the land corridor along the Sea of Azov that connects Russian troops with their supply lines in eastern Ukraine all the way from the Donbas region to Crimea.
It also poses a distinct military challenge, however. Russians are still holed up in the Zaporizhzhia nuclear power plant in Enerhodar, implicitly threatening a nuclear catastrophe were Ukrainian forces parked on the other side of the Dnipro River to try to reclaim the region.
Zaporizhzhia, the largest nuclear power plant in Europe, which fulfilled 20 percent of Ukraine’s electricity needs in peacetime, is on the front line of the war. A small action, deliberate or accidental, could trigger a meltdown at the site, with devastating impact on human life and the environment."
https://foreignpolicy.com/2023/05/02/ukraine-counteroffensive-zaporizhzhia-nuclear-power-plant/