The U.S. dollar started Tuesday on the back foot as investors took stock of developments in the Middle East and braced for a slew of speeches by central bank officials this week headlined by Fed Chair Powell to gauge the monetary policy outlook. The yen was pinned close to the key 150 per dollar level, keeping traders on edge for any signs of intervention by the Japanese authorities. The yen last fetched 149.62 per dollar, having slipped to 150.17 on Oct. 3, the weakest in a year, before getting some relief in a brief rally. Japan's top financial diplomat Masato Kanda said the yen was still perceived as a safe haven ... (full story)