This is not surprising. I believe it is part of a script put together by both communist parties of North Korea and China. The most important thing for both North Korea and China when it comes to the Korean peninsula is to get the U.S. military out of North Korea. China is using this behind the scenes as a bargaining chip in its trade disputes with the U.S.
The main reason given by North Korea is joint military drills between the South and U.S.
I believe the Kim regime is being coached now behind the scenes from Beijing as he suddenly met twice with Xi Jin Ping in the last month or so.
Kim suddenly cancelled a meeting with South Korea president shortly after meeting with Xi Jin Ping in Beijing. Both Beijing and Pyongyang are trying to put pressure on the South and America and believe they can both get everything they want if they play their cards right. This will all come to light so keep watching. I will keep you posted.