I was in a state of near shock,” says Volodymyr Kholosha as he recalls the moment that he first saw the burnt-out reactor at the Chernobyl Nuclear Power Plant on the day it exploded. “What I witnessed that day defied every scenario we had ever practised. The first few days were spent simply trying to comprehend what had actually happened.” Forty years on from the world’s most serious nuclear accident, Ukraine is fighting Russia in and around its nuclear power plants, including the world’s largest in Zaporizhzhia. Just last week, Russia launched drones and missiles along the flight paths near Chernobyl itself. Mr Kholosha warns that Vladimir Putin is bringing Ukraine to the brink of another disaster. “Russia has failed to learn the lessons of Chernobyl,” he says.…