I find thinking about war between North and South Korea, or primarily between North and South Korea, is really quite unthinkable. The world has changed so much since 1950 in terms of destructive military capabilities that we can't imagine a similar kind of military event taking place in the Koreas, so I'm one step away from considering the possibility of a Canadian deployment.
I would see all hell breaking loose there, with a tremendous loss of life, and opening up all kinds of potential for other disruption in the region. If I were a military planner, it's not something I would like to be contemplating. At this point I just can't see a role for Canada in the possible scenarios that I can imagine.