WHAT IF : US-USSR Joint Invasion of the Empire of Japan Between 1941-1944 ? (Maybe with the help of KMT in China?)

The USSR was slightly busy at the time with the whole 'being invaded and occupied by a genocidal German regime' , thing.
Can't happen any earlier than 1945.
Let's assume for the sake of the subject that the Soviet-German front goes much more favourable (but not extremely so) for the USSR than in our world, what would be the consequences of such action ?
For one, the USSR I can the see the KMT to have much less losses, however, this potentially opens up a re-start of the CCW much earlier. Don't know if that translates into "winning". Another thing is the fate of Korea, I can see only two ways of going : under KMT liberation or USSR liberation, that depends of course on the performances of both armies, unless somehow miraculously the US manages to land on it making a B-line directly there.
Manchukuo and Inner Mongolia could either become annexed by the USSR or the CCP or KMT directly. Maybe Inner Mongolia becomes part of Mongolia proper.
 
Let's assume for the sake of the subject that the Soviet-German front goes much more favourable (but not extremely so) for the USSR than in our world, what would be the consequences of such action ?
First, How?
Second, the USSR is first going to try to beat Germany and only then consider invading Japan.
For one, the USSR I can the see the KMT to have much less losses, however, this potentially opens up a re-start of the CCW much earlier. Don't know if that translates into "winning". Another thing is the fate of Korea, I can see only two ways of going : under KMT liberation or USSR liberation, that depends of course on the performances of both armies, unless somehow miraculously the US manages to land on it making a B-line directly there.
Manchukuo and Inner Mongolia could either become annexed by the USSR or the CCP or KMT directly. Maybe Inner Mongolia becomes part of Mongolia proper.
Assuming Germany magically collapses in late 1941 meaning that Pearl harbor happens but suddenly the Nazis collapse in one night and all of Europe is occupied by Allied forces.
The USSR is going to have a lot more difficulties ITTL, the Kwantung army was Japan's best but trough WW2 its best troops & equipment were diverted to other fronts which meant that when the Soviets invaded it didn't stood a chance.
The Soviets will still probably win but with a lot more casualties & difficulties than OTL.
Since Japan isn't in a hopeless situation, the Soviets conquer all of Manchuria and Korea and then stop and the US and UK are going to fight the Japanese navy, with a victory in ~two years for the Allies.
 
The USSR is going to have a lot more difficulties ITTL, the Kwantung army was Japan's best but trough WW2 its best troops & equipment were diverted to other fronts which meant that when the Soviets invaded it didn't stood a chance.
The Soviets will still probably win but with a lot more casualties & difficulties than OTL.
The Kwantung Army at its peak is still going to get thoroughly steamrolled by the 1942 era Soviets. The T-34 and KV-1 alone are things that the Japanese have absolutely no answer for.
 
Let's assume for the sake of the subject that the Soviet-German front goes much more favorable (but not extremely so) for the USSR than in our world, what would be the consequences of such action ?
First, How?
Stalin prepares when he gets the first whiff of German preparations? And doesn't kill nearly all the high commanders of the Red Army in the purges?
 
Stalin prepares when he gets the first whiff of German preparations? And doesn't kill nearly all the high commanders of the Red Army in the purges?
Doesn't solve the USSR' problems.
And preparing things a month before the German invasion isn't going to help much.
 

Garrison

Donor
Doesn't solve the USSR' problems.
And preparing things a month before the German invasion isn't going to help much.
Yes the problems were Stalin's refusal to believe an attack was imminent and his panicked reaction when it began.
 
You need a proper POD that leads to either no Nazis or Nazis not being a threat in 1941. Otherwise, this thread is beyond implausible. You also need a POD where Japan antagonizes both the USA and USSR at the same time despite the previous POD requirement.

Anyway, there are Operation Downfall threads, use those for inspiration.
 
A lot of things have to radically change within the KMT and Soviet governments to make them much more prepared and competent to not only thwart, the nazi and Japan invasion but to counter invade and for the Soviets to be ready to invade Japan with competent navy. You also need a US that mobilizes way better 1941, so a pod starting late 1920s early 1930s.
 

Garrison

Donor
Out of curiosity. How feasible would it have been for the Americans to assault and invade Hokkaido via the Aleutians route?
Not very, the Aleutians were a miserable place to use as staging grounds for further advances, the extreme cold is just too much of a challenge for an operational base.
 
Top