Japan's financial authorities on Friday ordered Mizuho Bank and its parent Mizuho Financial Group Inc. to improve their operations and clarify management responsibility for a series of system failures, in punitive actions that prompted the major financial institution to replace top executives.The Financial Services Agency ordered them to implement immediate preventive steps and submit additional measures by Jan. 17, while the Finance Ministry ordered the bank to take corrective action for breaching the foreign exchange law following a system problem, the first such order to a bank since the…READ FULL ARTICLE