The China-backed Asian Infrastructure Investment Bank (AIIB) has been formally established and is expected to be operational early next year, the official Xinhua news agency said on Friday. The bank’s establishment came after 17 funding members of the AIIB, which account for just over 50 percent of its share capital, ratified an agreement on the bank, state television quoted Finance Minister Lou Jiwei as saying. First proposed by President Xi Jinping less than two years ago, the bank has become one of China’s biggest foreign policy successes.