Ukraine’s president Volodymyr Zelenskyy has fired two senior officials – the chief of the domestic security agency and the top state prosecutor.Zelenskyy cited hundreds of criminal proceedings against their office’s employees – including cases of treason and collaboration with Russia. Neither Ivan Bakanov, the now former spy chief, nor Iryna Venediktova, the country’s ex-prosecutor general, have commented. The decision comes as Ukrainian and British military officials claim Russian forces are regrouping and preparing for their next offensive in both eastern and southern Ukraine.