Japan is adding a fresh layer of uncertainty to global financial markets by potentially triggering a new bout of turmoil in bond markets and dampening the appetite for risk assets, as Tokyo’s pursuit of increased defence spending stokes concerns about fiscal discipline and sends sovereign bond yields to multi-year highs. The nation’s 10-year bond yield hit 3.03 per cent this week, a level not seen in three decades, while 30-year bond yields traded at 4.1 per cent, also nearing a 30-year high....