It would be great if we can end all hostilities with North Korea and pull them away from China. The North Koreans aren’t any worse than the Nazis or Japanese were in WW2 and we allowed a lot of them to go unpunished because we either needed them to help stabilize the countries after the war, or needed their expertise in certain fields. It’s not like we can’t work with people who have blood on their hands in certain situations. If North Korea agrees to denuclearization and ends all aggressive behavior towards us, then we should give them security assurances and work toward pulling them away from China.