As the global geopolitical balance weakens, Rio will host a tense BRICS summit on July 6 and 7, 2025. Designed as a counterweight to the G7, the bloc struggles to embody the unity of the global South. Internal disagreements, Xi Jinping's absence, and Donald Trump's offensive comeback: the 17th edition illustrates less of a rise in power than a questioning of the strategic coherence among its members. In an era of multipolar ambitions, the BRICS are facing a crisis of legitimacy as much as a test of international credibility.