So defending South Korea from being brutally over-run by an unwarranted North Korean attack is intervention into North Korea? Somehow 60 years of direct access to the massive chines market and North Korea's economy is still a fraction of South Koreas.

How did we intervene in the USSR, the largest county in the world, to destabilize it. And how could we, given socialism is so efficient and they had all the massive resources they'd ever need, right?