Yang Moo-jin, a scholar with the University of North Korean Studies in Seoul, says the North is "playing hard ball".

VOA: standard.2010.05.27

Yang Moo-jin is a professor at South Korea's University of North Korean Studies.

VOA: standard.2010.05.03

Yang Moo-jin is a professor at Seoul's University of North Korean Studies.

VOA: standard.2009.09.09

Yang Moo-Jin,is a scholar at Seoul's University of North Korean Studies.

VOA: standard.2009.12.30

Members of a far-left minority party surrounded trade committee Chairman Park Jin's podium and tried to physically block a vote to advance the trade deal to a full ratification vote.

VOA: standard.2009.04.22