As the 15th BRICS summit is being held in Johannesburg, South Africa, CGTN's Wang Guan talks to Erastus Mwencha, former deputy chairperson of the African Union Commission. With more countries eager to join, Mwencha says the bloc has opened a new window for the Global South to voice pressing issues. The grouping has also strengthened trade and investment so as to bypass illegal sanctions imposed by the West. Mwencha reckons that members can't agree on all issues at all times, but when it comes to the interest of the Global South, BRICS countries "set aside their differences, and stand together."