Many African leaders consider other African countries as being brother and sister countries.
One can understand that they are reluctant to bend under Western pressure to alienate fellow African countries who lost favour with the western world.
They will support their own flesh and blood against all odds.
That may also explain why the border control in some African countries are applied so half-heartedly.
At some level within their minds there are no borders. Just one African brotherhood and sisterhood
Nkosi, sikelel' iAfrika;
Yiva imitandazo yetu
Lord, bless Africa;
May her horn rise high up;
Hear Thou our prayers And bless us.