When all mainland Chinese territories are Chinese controlled, they can invade Korea and/or Indochina if they are Japanese controlled. They can also declare war on the Imperialist powers and attack them in territories outside China.
When all original Soviet territories are controlled by the USSR , they can declare war on the Capitalist powers and attack them in any territory or sea zone.
When either Red China or Commie Russia declare war on the allies:
1) the other commmunist power may also declare war on the western allies
2) the allies may declare war on either or both of the communist powers
3) Germany, Japan, and all Neutral countries will join the allies. All hostilities cease between axis and western powers.
The Soviet union and China can never declare war on each other. Western powers may never declare war on each other.
Once the Reds are at war with the free world, the global war will continue until the complete extermination of either the commmies or the plutocrats. Extermination is declared when every last sea or land unit has been eliminated and all of their territories are enemy controlled.