So the whole reason why I asked the question of what Japan would do in a 1944 offensive against the Russian Empire is this - besides gaining the resources of Siberia near Lake Baikal and besides this region being the main focus of the offensive, would the Japanese attempt to send troops to the Aleutian Islands as well?
Here's a map to help visualize what I mean:
Direction of Japanese Siberian Offensive - Summer-Fall 1944
So that's really what I want to know too honestly. Alaska is still part of the Russian Empire by 1944. While Siberia is clearly coveted by the Japanese, how would Alaska factor in to Japanese plans for expansion in Siberia, if at all? Would they attempt to attack the Aleutians as they did in our timeline? Why wouldn't they if they decide not to? Why would they attack if they did? If not Attu and Kiska, would they attack other islands like Adak?
To me there might be a slim chance of the Japanese attacking the Aleutians if they saw the need to. Reasons for attacking the islands can be taken from our own timeline actually - granted an attack was considered given the United States' presence in the Pacific. So I am just wondering if plans would change because Alaska is still a Russian territory.
These were some of the reasons Japan attacked the Aleutians below from OTL (taken from Wikipedia):
"The strategic position of the islands of Attu and Kiska off Alaska's coast meant their location could control the sea lanes across the Northern Pacific Ocean. Japanese planners believed control of the Aleutians would therefore prevent any possible U.S. attacks from Alaska, allowing for control of Northern Pacific transportation routes."
"The Japanese Navy had gathered extensive information about the Aleutians, but it had no up-to-date information regarding military developments on the islands. Admiral Yamamoto provided the Japanese Northern Area Fleet, commanded by Vice-Admiral Boshiro Hosogaya, with a force of two non-fleet aircraft carriers, five cruisers, twelve destroyers, six submarines, and four troop transports, along with supporting auxiliary ships. With that force, Hosogaya was first to launch an air attack against Dutch Harbor, then follow with an amphibious attack upon the island of Adak, 480 miles (770 km) to the west. Hosogaya was instructed to destroy whatever American forces and facilities were found on Adak. Hosogaya's troops were to return to their ships and become a reserve for two additional landings: the first on Kiska, 240 miles (390 km) west of Adak, the other on the Aleutians' westernmost island, Attu, 180 miles (290 km) west from Kiska."
Again, this is with the US in mind since they control Alaska.
So, again, my question is whether the Japanese would still hold this view in TL-191 for their plans to invade Siberia.
I'd like to hear your guys' thoughts on this - I have my own but anything is good.
My reasoning is that the Japanese would want to cut off Russian Alaska from the mainland and effectively isolate any Russian forces that may be used as reinforcements to be sent to Siberia. The problem is that Russia may not even have a large military force here given how they view Alaska in TL-191, which runs in stark contrast to US military views in our timeline. Then again the US in our timeline did not have a very large force here as well.
I don't think Japan would not consider attack Russia just because they were "allies" in both Great Wars, especially in the Second Great War. To me, Japan was always out for itself and allied with Russia and Britain out of specific circumstances - namely that they shared common foes despite having animosity toward each other. The Russians and the Japanese, even without a Russo-Japanese War in 1904, would still not see eye-to-eye with each other I believe, especially over spheres of influence in Manchuria.
Plans would be drawn up by the Japanese for sure - definitely for Siberia and possibly for Alaska and Aleutians. Question is whether they would follow up those Aleutian plans with an actual attack in TL-191.
In the grand scheme of things though, whether its Siberia, the Aleutians, or both, I think this conflict between the Japanese and Russians in 1944 would the Russo-Japanese War we were expecting decades ago.