Overview
- An IAEA assessment found the Chernobyl shelter lost its primary containment functions after a February drone strike and called for urgent comprehensive repairs, enhanced monitoring, and international support.
- Ukraine reported a large overnight barrage hitting energy sites in eight regions, citing 653 drones and 51 rockets, while a fire damaged the Fastiv rail hub near Kyiv and forced suburban service cancellations.
- Ukrenergo said grid restoration will take weeks and warned most areas will face 12–16 hours of rolling outages each day, with knock-on losses of water service.
- Russian regional authorities reported damage from Ukrainian drones in Ryazan and Voronezh with no casualties, and Chechen leader Ramzan Kadyrov said a drone hit a high-rise in Grozny and vowed retaliation.
- IAEA experts are in Ukraine from 1–12 December to assess critical substations, and fresh Russian strikes continued into Sunday with attacks reported on the industrial city of Kremenchuk.