Rio de Janeiro is rolling out one of its largest peacetime security operations in recent memory as leaders and senior officials from the Global South’s major emerging economies convene in the coastal city for this week’s Brics summit.Officials say about 20,000 military personnel will be deployed to guard leaders from 28 countries and seven international organizations, including the UN and the World Bank.Airspace over the summit venue, Rio’s Museum of Modern Art, will be strictly controlled....