I am an real native born American who defended this country. Unlike our demented president and his party, I will always be worried about the USA the most.馃嚭馃嚫
I can't see where China is more than just threats to look tough - they have done this for years, and they are too intertwined economically to do more that jut blow hot air. The downside for them is too great.
NK I think only cares about boosting Kim's ego - making him look like a big shot on a global stage.
Russia peddles influence and is actively trying to claim territory. Plus, their propaganda has already corrupted a political party in the USA.
I notice you don't have Iran on your list.
EDIT - I see you have added Israel/Palestine. I do have a bit of a fear of Israel doing something boneheaded out of anger and sparking a much wider conflict, and the fallout from that affecting the politics in other countries as they are then forced to take sides.