Cuba's first Vice President Raul Castro said that G-15 is like a catalyst that would increase cooperation among nations of the South.
Speaking at the opening of the G-15 Summit in Havana on Thursday, he said that the grouping has reached a point where it can strengthen its role to confront the growing challenges of globalisation and development.
"Our countries have no alternative than to unite and concentrate our actions on confronting the common obstacles we face," he said.
G-15 was created under NAM to increase South-South cooperation and to make possible greater cohesion and solidarity among developing nations so as to bring about a more fluid and positive North-South dialogue, he added.
The Group includes Algeria, Argentina, Brazil, Colombia, Chile, Egypt, Jamaica, India, Indonesia, Iran, Kenya, Malaysia, Mexico, Nigeria, Peru, Senegal, Sri Lanka, Zimbabwe and Venezuela.