@Caesar:
I want the opinions of the players who say they always send them west. Why do you think it’s a good idea to leave all your east open for Japan, I get it that you’re trading around 10 ICP worth of territories for 18 infantry and 2 AA guns but you are giving Japan a better position with the possibility of capturing you and/or entering China and UK from the West.
The reason I usually retreat them is because I need them to prop up China (or Moscow). I’ll decide around Round 3 whether I’m retreating these units to Russia (if Germany is targeting Moscow on G8) or help out China. It’s common for the Chinese army to be forced to retreat towards Moscow. Sometimes combining with the retreating Siberian troops is the only way to keep China alive. Note that if Japan breaks the Mongolia pact, these Russian units could march through Mongolia into China.
This dynamic is very different in the balanced mod where Russia can’t intervene in China.