immature ones: Kim Jong-eun(N. Korea,) Barak Obama(U.S.)
sort of OK : Abe(Japan,) Lee Myung-bak and Park Geun-hye(S. Korea, current and incoming president)
Cunning and devious: Xi Jinping(China,) Vladimir Putin(Russia)
I agree, China and Russia are serious players.
The last two are the only ones who know how to play ball, IMO. We should be cunning as well, or we risk losing it all.