President Volodymyr Zelensky of Ukraine said on Thursday he had removed his top general in the most significant leadership shake-up since Russia invaded Ukraine almost two years ago. While praising Gen. Valery Zaluzhny‚ the commander who has led the nation’s war effort for two years‚ Mr. Zelensky said “urgent changes” were needed to ensure victory. “Starting today‚ a new management team will take over the leadership of the Armed Forces of Ukraine‚” Mr. Zelensky said in an evening address...