Long-term Japanese government bond yields are likely headed for a three-decade peak of 3%, analysts and investors say, as inflationary pressures from the Iran war spur expectations for more aggressive Bank of Japan policy tightening. Benchmark 10-year JGB yields topped 2.6% on Thursday for the first time since May 1997, amid a rising tide for bond yields globally as the conflict in the Middle East lifts energy and commodity prices. [...]