A convoy of jeeps carrying United Nations nuclear inspectors was crossing Ukraine early on Wednesday toward the Russian-held Zaporizhzhia power plant, holding the world's hope that it could help secure the safety of the facility in the middle of a war zone and avoid a nuclear catastrophe. Yet ominously, the Russia-backed local authorities in Zaporizhzhia claimed that Ukrainian forces shelled the territory of the plant and the nearby town of Enerhodar overnight.