The 51-year-old mayor of Kyiv, and former heavyweight boxing champion of the world, told The Telegraph that increasing Russian attacks on power plants have left his country on the brink of a fresh humanitarian crisis. “We are doing everything we can do to save the lives of our people and to protect them,” he said, banging his huge fists on the table. “But this winter will definitely be a huge challenge for us.”In little over a fortnight, Moscow’s strikes on power stations and the wider grid have left the country grappling with outages and questioning whether the system will survive...