Charles K. Armstrong, Professor of Korean Studies at Columbia University, discusses the heavily militarized Korean DMZ and disputed borders that make North/South conflicts unavoidable; how the N. Korean bombardment was a response (justified or not) to provocative S. Korean war games; how US interference — including a significant military presence in the South — hobbles reunification talks; Seoul's risk of annihilation by an artillery barrage from the North and why N. Korean dictator Kim...