Ajay Banga has left Citi to become president COO of Mastercard after less than a year at the helm of the US banks Asia-Pacific business. The news is a blow to Citi, which was in the process of reorganizing its Asian businesses under Banga as detailed in a May story in Euromoney, Banga demolishes Citis Asia-Pac silos. Although Citi declined to comment officially on the move beyond a statement saying...