This seems like an odd thing for the Swiss to do, depending on how the accounts/funds were registered, e.g. in the name of the families or the state, etc. Also, an African state having a Swiss bank account also seems odd, at least to me.
I wonder if Obama has a Swiss bank account?
Many 3rd world countries, including those in Africa, are not 'states' in the classic sense. They do not have a well developed sense of community-property backed by a self-perpetuating legal system. Instead they have ad-hoc law eminating from a strong-man dictator who quite naturally treats the public treasury as his own private piggy-bank.