S Korea pension fund shuns US debt By Song Jung-a in Seoul, Andrew Wood in Hong Kong and Michael MacKenzie in New York Published: March 26 2008 19:39 | Last updated: March 26 2008 19:39 The world’s fifth-largest pension fund will no longer buy US Treasuries because yields are too low. The move signals what could be a big shift by financial institutions away from US government debt into higher-yielding assets. South Korea’s National Pension Service, which has $220bn in assets, said on Wednesday it wanted to broaden its range of overseas investments. “It is difficult to buy more US...