<h1>Russian authorities accuse Ukrainian drones of causing transformer fire at nuclear plant; UN urges protection, no injuries</h1> Russian authorities accused Ukrainian forces of launching drone strikes that caused a transformer fire at a nuclear power plant in the Kursk region during Ukraine's independence day, with the plant reporting the fire extinguished, no injuries and normal radiation levels; the UN nuclear watchdog said it had not independently confirmed the report but urged protection of nuclear sites. Regional officials also reported drone strikes and port fires, while each side reported drone and missile interceptions overnight. Fighting continued in eastern front-line areas. Several Western states announced new air-defence aid and high-level visits to Kyiv.