Brazil has put the Bermuda triangle of international diplomacy – reform of the United Nations and other multilateral bodies – at the heart of its presidency of the G20, arguing that the war in Gaza and shifts in the economic power balance finally make change possible. A two-day meeting of G20 foreign ministers in Rio de Janeiro heard a blunt attack by the UK foreign secretary, David Cameron, on the Russian foreign minister, Sergei Lavrov, over the invasion of Ukraine. But Brazil said it was trying to steer the G20 away from blame games to solutions. Brazil’s top diplomat, Mauro...