Income Gain by Japan: As we already see from above by J7 Japan collects $20 more income from capturing Russian territories. If we consider the world view, and not just the Moscow view, that means by Turn 9 we are slightly ahead based on the below calculations and on Turn 10 we are slightly behind.
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Gain of 20 Eastern troops = + 64
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Loss of Russian income = - 34
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Gain of Japan income = - 34
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Gain of 3 Mongolians that survive = + 9
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Loss of 1 Jap infantry to kill 3 Mongolians that do not service = + 3
Based on this world view perspective it now does not make as much sense to send all the troops to Moscow as we are hurting ourselves in the long run. And we have not even taken into consideration that by leaving troops in the east we can pin Japanese ground troops making life more difficult for Japan.
So out the window goes Option 1 - All 20 Russians to Moscow.
Option 2 – 6 to Moscow and 14 left behind AND Option 3 – All 20 stay in the east:
I think we can safely assume that we can protect the bulk our eastern flank with both option 2 and option 3. With 14 units we can be pushed back into Buryatia which means Siberia and Soviet Far East would be in Jeopardy. With 20, except for Turn 1, we can probably safely sit in Amur and thus only Soviet Far East is at stake. However, with a lot of targets I would think the Japanese are not going to send a transport just for Soviet Far East so the comparison is more likely $2 (for 14) or $0 for 20. So, we are looking at a $2 difference per Turn by sending 6 infantry towards Moscow. Those 6 infantry are worth $18 TUV so it would take 9 Turns to lose money on that scenario.
The other difference is how many Japanese troops do you pin in Manchuria/Korea.
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12 infantry probably pins 9 infantry and an AA gun
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18 infantry probably pins 11 infantry, 1 fighter and an AA gun
So 18 gives us most likely no loss of income and pins 3 more units that are not making there way to China, which by the way protects Russia’s right flank and hastens how quickly Japan is stalemated and allows the US to send more forces to Europe earlier.
So based on this analysis I would say do not send all 20 Russians back, it is okay to send 6 back (Option 2) but I think it is slightly better to keep them all in the east (Option 3).