So with speculation that the majority of North Koreas capital coming from BTC, who thinks that China banning ICO's was a step to curbing North Koreas power?
Nah I don't think so. China was looking to ban this for some time now, it was gonna happen sooner or later. I don't think it has any connections with North Korea, China wouldn't want to do something that will make USA's job much easier.
If chinas move will benefits US and make n.Koreas strength will be in question I'm sure its not like that China also wanted to show how powerful their are and they will not interfere anyone who challenge US bitcoin is far from what you are thinking mate its economics and China knew that bitcoin already threaten them.