TOKYO : The dollar was on the defensive, shares edged up and gold scaled new heights on Wednesday as global markets counted down to an anticipated rate cut by the Federal Reserve later in the day and waited on signals around the extent of future easing. The euro surged to a four-year high against the greenback in the prior session on the Fed easing bets, while oil remained firm following Ukrainian drone attacks on Russian refineries and ports. Asian equity indexes were led by Hong Kong shares,