Leaders of eight African countries -- Angola, South Africa, Nigeria, Senegal, Ethiopia, Egypt, Algeria and Libya -- will take part in the G-8 Summit that opened Wednesday in l'Aquilla, Italy, a European spokesperso n announced in Brussels. The African leaders will Friday participate in a working session on food security. According to a report of the European NGO Action Aid, countries should devote at least US$ 23 billion per year by 2012 to food crisis in order to reduce by half, hunger in the world by 2015.