"Why, 64 years after the Korean War, a quarter-century after the Cold War, are we still obliged to go to war to defend South Korea from a North with one-half the South’s population and 3 percent of its gross domestic product?We should trade with North Korea.
Why are we, on the far side of the Pacific, still responsible for containing North Korea when two of its neighbors — Russia and China — are nuclear powers and South Korea and Japan could field nuclear and conventional forces far superior to Kim’s?
How long into the future will containing militarist dictators in Pyongyang with nuclear missiles be America’s primary responsibility?"
Claim aggression against North Korea is really a prelude to war with China. This article explains why I'm skeptical.