Nil. Indeed it may make things worse.
Nothing at all. It is because the African Union is an association of killers, rapists, thieves and scum of the earth.
The only compromise possible with murdering dictators is your own slavery. Jacob Zuma came from Tripoli having "negotiated a ceasefire" with a man who happily uses jet fighters, artillery and snipers on his own people. Why not "negotiate a ceasefire" with your next armed murderer? Or perhaps this is what crime fighting is like in South Africa.
The African Union is chaired by none other than Obiang Nguema Mbasogo - President of Equatorial Guinea, since 1979, having undertaken a coup against his insanely drug riddled murdering uncle -Macias Nguema. Equatorial Guinea has remained under the iron grip of Obiang, whilst he and his family, including his playboy son Teodoro Obiang Nguema Mbasogo, enjoy the lavish wealth of one of Africa's richest oil-soaked countries, whilst most of the population remains illiterate and with a subsistence lifestyle.
The African Union has improved performance in recent years, suspending the Ivory Coast and Madagascar because of their political crises. It should do the same for Libya. The problem is Libya helps fund the kleptocratic scum and their comfy lifestyles. Zimbabwe notably has also faced no real sanctions from the African Union. It refuses to recognise the international arrest warrant that was imposed against Omar Bashir of Sudan in response to the massacred in Darfur.
In short, a club of scoundrels is not a reliable one to eject or punish one who acts as they do.
The rebels in Libya quite rightly are ignoring all of this. Jacob Zuma, who leads a country that is increasingly looking more and more like a one-party state in practice if not in law, has no standing or credibility in Libya for anyone other than Gaddafi seeking power.