Speculation on how the RR might work, based on the simplest rules I can formulate.
The map doesn’t follow the Treaty line exactly, but assume it ceeds the CPs:
Finland, Livonia, Poland, Belarus, Ukraine, Sevastopol.
Leaving “Great Russia” as Karelia, Moscow, Tartarstan & Kazakhstan.
When the treaty is enacted:
1. All Russian units are removed.
2. The CPs must evacuate Great Russia by either
a. Moving all units in these tt one space into CP held tt, or
b. Moving them into the Mobilization Zone, to be placed in the respective capital the next time that nation places new units (no cost).
3. CP units in the Ceeded tts may remain, or be sent to the MZ as per b above; however in order to occupy and collect income from them the CP must retain at least one infantry in each ceeded tt to hold down local nationalists. The Allies may also control these tt under the same terms.
4. No player may enter Great Russian tts under any circumstances.
5. If capturing the capital allows the victor to grab the vanquised nation’s money, all Russian held cash is distributed between the CPs. If they cannot agree on the cut the Russian player chooses who gets how much.
6. Any allied units on Great Russian soil at the time of the treaty have one turn to evacuate under the allied equivalents of a & b above; if they cannot do so they are eliminated (interned).
7. Allied units in the Ceeded tt may remain and fight or evacuate as per a & b.