I don't think much of anyone thinks unification is actually possible absent some big change, and indeed neither government is truly pursuing it actively (unless "trying to destabilize and make the other government collapse" qualifies). But both are trying to be as ready as possible for unification when the opportunity presents itself (most likely, it would happen in a way alike to German reunification - that is, the government of one of the two countries becomes quite compatible with the other, because the previous form of government in it collapsed and was replaced by that of its neighbor)