States as international persons — In general — Sovereignty and independence — In matters of domestic jurisdiction — Biafra — De facto government — Validity of acts of judges in rebel enclaves — Doctrine of necessity or implied mandate — Whether policy of lawful government expressly or impliedly opposed to mandate — The law of Nigeria

States as international persons — In general — The beginning of State existence — Nigerian civil war — Biafra — Usurping government in de facto control of part of country — Validity of acts of judges in rebel enclave — Doctrine of necessity or implied mandate — Whether applicable to civil war — Policy of lawful government — Whether expressly or impliedly opposed to mandate — The law of Nigeria