For serious skiing in the area:

Alpine skiing (lifts, combed slopes): Nagano or Hokkaido in Japan (whats better than sushi and sake apres ski?)
Heli skiing (helis, back country): Kamchatka in eastern Russia

The latter is still on my to-do list.

Only skiing i've done in China was at Shijinglong and an indoor slope in Shanghai, and wouldn't recommend either to any advanced skier. A few old chairlifts (think 1970's ski lifts in Europe) with crazy locals racing straight down the slopes without any idea how to stop other than to let themselves fall.