Burundi's president-elect Evariste Ndayishimiye (C, front) signs a condolence book for Burundian president Pierre Nkurunziza who passed away recently in Bujumbura, Burundi, on June 13, 2020. Burundian Constitutional Court on Friday announced the swearing-in of the Ndayishimiye "as soon as possible", after the death of Nkurunziza on Monday. (Photo by Evrard Ngendakumana/Xinhua)

Burundi's president-elect Evariste Ndayishimiye delivers a speech after signing a condolence book for Burundian president Pierre Nkurunziza who passed away recently in Bujumbura, Burundi, on June 13, 2020. Burundian Constitutional Court on Friday announced the swearing-in of the Ndayishimiye "as soon as possible", after the death of Nkurunziza on Monday. (Photo by Evrard Ngendakumana/Xinhua)

Burundi's president-elect Evariste Ndayishimiye signs a condolence book for Burundian president Pierre Nkurunziza who passed away recently in Bujumbura, Burundi, on June 13, 2020. Burundian Constitutional Court on Friday announced the swearing-in of the Ndayishimiye "as soon as possible", after the death of Nkurunziza on Monday. (Photo by Evrard Ngendakumana/Xinhua)