KYIV — Ukraine’s parliament voted Thursday to appoint Andrii Sybiha, the country’s former ambassador to Turkey and past deputy head of the presidential office, as foreign minister, just hours after accepting the resignation of his predecessor, Dmytro Kuleba.

       A cabinet reshuffle this week, which saw several top officials submit resignations — and in some cases be quickly appointed to positions elsewhere in the leadership — comes as President Volodymyr Zelensky faces what he has acknowledged will be a critical period in the war.