Sudan president pleaded with UN

The Sudanese President has sent a resquest to United Nations to allow Biafra stand as a separate Country. He believes UN can help Biafra actually their agitation speedily.
According to the voice of Biafra magazine, United Nations paid an important party in liberating South Sudan and they should do the same thing for Biafra.
If any region demands separation within its country and that demand has lasted for 50 years that region is deemed to be granted them their request.
Biafra is long overdue how come Biafrans, that has been agitating for their right since 1970, and UN is keeping quiet, Let Biafrans go.