Hmmmmm...
How about making the second great depression really devastating for USA and EU? Loss of IC, DI, war entry and Mp and rise of dissent while China would benefit from it(USA and EU having a small cold war they would of course to turn to other bussiness partners, I.E China and Russia) and Russia would either benefit from it or get the civil war. This could potentialy lead to an "Sino-Russian threat". I really would like to see US getting nerfed a bit... They will no doubt have the lead in the start. And economic crisis might let China/Russia to reach their level.
I honestly see only few reasons for Russia invading Finland(afterall, they are our largest trading partner and they would get in a diplomaticaly difficult postion) except gaining sole control of the Finnish Gulf so they could built all the oil harbors they want and getting more wood and some trivial amount of other resources. And for the other countries... Why to fight for some pieces of land and get yourself to troubles? Kazakstan and Azerbaidan are exceptions. They have oil, the life blood of modern world.
I see no reasons why China would ally with NK. I can, however, see reasons why they could try to puppet them. Afterall, they are annoying bastards sitting next to them.
If you want my opinions...
I must say that a Sino-Russian conflict would be better and more realistic than Sino-American conflict. Either a The Dragon and the Bear type conflict or war over Kazakhstan.
Wars in Africa, Middle Eas, Balkanst and South America. Definedly.
If US ever gets to war with China, I doubt that the chinese will just sit in their continent.