OK so what if Japan does something like this:
J1
Build 1 minor IC, 1 tank, 1 inf and 1 mech inf.
use sz 6 transport to drop off 2 inf in Siberia. drops Russia’s economy by 1. May help Germany in turn 3.
take Chahar with 2 inf and 1 art from Jehol. Important: also move in mech inf from Manchuria to Chahar!
Attack China wherever else. Don’t attack UK or US or Anzac!
use sz 19 trn to non-combat 1 inf and 1 tank to Jehol.
Place minor IC in Manchuria. Place everything else in Tokyo.
J2
Build 3 tanks, maybe another trn and maybe a minor IC for Shanghai.
Attack Suiyuyan with units from Chahar and tank from Jehol. If China placed 4 inf there, use as many planes as you need to take it with minimal losses.
Attack China elsewhere, take Soviet Far East with 1 inf from Siberia.
Non-combat 2 inf and 1 mech inf and 1 tank to Jehol.
Place 3 tanks in Manchuria.
J3
Attack Kansu with units from Suiyuyan and as many planes as necessary. Japan is now on Russia’s border on J3.
Attack China with whatever else.
Non-combat 1 mech inf and 1 tank from Jehol to Suiyuyan.
Non-combat 3 tanks from Manchuria to Chahar.
Position Japan to take money islands and attack UK.
J4
Units from Kansu and Suiyuyan attack Novosibirsk. Is Russia going to do anything about this?
J5
Units from Novosibirsk attack Samara. Is Russia going to do anything about this?
Can Germany hang on till turn 5?