The only solution is a military invasion of NK

1. The DPRK has nuclear weapons

2. The Democratic People's Republic of Korea and the People's Republic of China have a treaty going back to 1961 which in Article II clearly states that: "The Contracting Parties undertake jointly to adopt all measures to prevent aggression against either of the Contracting Parties by any state. In the event of one of the Contracting Parties being subjected to the armed attack by any state or several states jointly and thus being involved in a state of war, the other Contracting Party shall immediately render military and other assistance by all means at its disposal."

Aggression on them is aggression on China, good luck! 😄