China’s role really depends on what Japan wants to do with it.
If Japan wants to ignore it, China should be annoying, spread out, and kill as many Japanese infantry as possible. Break through the lines, place your build in a territory you just captured, and force Japan to run all over the place, taking the Japanese troops in the wrong direction as often as possible.
If Japan wants to bypass China to get to the back side of Russia, China should stack into one big stack in the center of the country (Shensi) so that Japan can only pass it in force, then retreat to Tsinghai.
Either way, you should always protect your fighter since it can’t be replaced. This means parking it out of range of Japan’s air force.
You want to keep the Burma road open for as long as possible, so as to collect your six IPC NO.
Marsh