(Bloomberg) -- President Xi Jinping failed to attend a business forum in South Africa where he was expected to deliver a speech defending China’s economy and its support for emerging markets, as fears mount that the Asian nation’s struggles could cause global turbulence.Most Read from BloombergMusk Told Pentagon He Spoke to Putin Directly, New Yorker SaysGoldman Is Cracking Down on Employees That Aren't in Office Five Days a WeekHuawei Is Building a Secret Network for Chips, Trade Group WarnsBor