Some more insight on the mysterious Kim Yong Chol letter: Pompeo’s NK visit cancelled because of demands for immediate end-of-war declaration, NIS says english.hani.co.kr/arti/english_e…
The Moon administration is also on board with an EoW declaration by the end of 2018, with "complete denuclearization" to follow; KYC wasn't out of phase with the inter-Korean understanding here.
Re-reading Trump's June 12 presser remarks, this bit sticks out to me—did he verbally give Kim assurances that the US would sign on to an EoW declaration/treaty? KYC might want to see the money now. (This is why it's good to write things down.) 
We know Sohae dismantlement was one of the US verbal asks that wasn't in the Singapore declaration text; that dismantlement is stalled now—perhaps pending movement on the EoW issue?
Huge, huge scoop by @AlexWardVox: “President Donald Trump told North Korean leader Kim Jong Un during their Singapore summit in June that he’d sign a declaration to end the Korean War soon after their meeting” vox.com/2018/8/29/1779…
