1. Bring the troops home, save billions of dollars AND seem like the US wants peace.
2. Meanwhile harass this bastard at every turn. Recon flights with fighter escorts up to and into Nork airspace.
3. Encourage the South Koreans to begin commando raids on strategic targets.
4. Drone or cruise missle attacks on strategic targets.
5. Stop all aid immediately.
6. Sever road and rail links to communist China.
7. Bomb them with counterfeit Nork currency.
Two can play the games they have been playing. Of course, don't expect any of this during Obama's regime.
The South Koreans really don’t need us there anymore. I think that their fairly impressive military can defeat these nutritionally-deprived zombies if it came down to it. That is... if the South Koreans have gotten too soft in the intervening 20 years or so since I last trained with them.