Kaja Kallas, the EU’s top diplomat, threatens harshest sanctions yet on Russia after strike on Kryvyi Rih, the home town of Volodymyr Zelenskyy Russian drones have slammed into a busy shopping centre in central Ukraine, killing 16 people in an attack that Volodymyr Zelenskyy condemned as “cynical and despicable”. The EU’s foreign policy chief, Kaja Kallas…