Ukrainian President Volodymyr Zelenskyy vowed to overhaul the country’s scandal-ridden energy sector as he looks to stem outrage following accusations of wide-spread corruption that have included an old friend and former business partner. Zelenskyy said the leadership of at least three state-run energy companies would be sacked and quickly replaced and that other changes were in the works. The scandal comes as Ukraine is under massive pressure from intensifying Russian air strikes on energy installations around the country as the deep cold…