South Korean President Moon Jae-in and Chinese PM Li Keqiang have agreed that they want to see a guarantee of economic aid for North Korea if the nation agrees to denuclearize. The two leaders also discussed a possible railway connection going through North Korea.
The US has been hesitant to make any specific pledges to North Korea on what would happen in return for denuclearization. Clearly, economic assistance is a top priority, as North Korea has indicated in recent comments that once peace is achieved their focus will be on improving their struggling economy.
Railroads connecting them to China and South Korea would be a good start, certainly. South Korean officials say they also want to offer North Korea some sort of security guarantees.
Security assurances are also a top priority for North Korea, as they have said the only reason for their nuclear arsenal is to deter a US attack. With guarantees that such an attack is not coming, they’d have every reason to scrap the program.