Unifcation of North and South

Interesting that despite the fact the Korean people could benefit greatly from a unified Korea, still many oppose this action. The article discusses that the military in the North may reduce in power as a result of this occurence. I found it interesting that North Korea's Chief delegate, Kwon Ho ung stressed the need for the powers to work together, while he criticized the outside powers refering to the US as a force that has been nothing but an obstacle to this process.
Does he see the US as an obstacle becuase of the different ideologies of the North and South? Or could this actually be a tactic that he uses to create a common enemy (The Western world- US), hence unifing the North and the South?