it is J/A 1941 and Russia advances into Warsaw (heavy investment into Europe after Germany went into Spain and Japan trying to achieve things in China and west of Singapore).
Then the game hangs (it looks like MWiF gets stuck calculating something).
If the save is loaded this can be recreated by resolving the attack on Warsaw and then advance some Russian units into it.
I did work around this by NOT advancing into it and had Germany promise not to walk into Warsaw again -although they most likely wouldn't anyway



