The Japanese didn’t have any capabilities of doing anything more than tying down the Far Eastern Garrison on the northern Manchukou border. As soon as Zhukov recovered he would have taken the Kwangtung army to task because these were not conscripts but the best Soviet soldiers that were specialized in cold weather fighting. They were largely mechanized and had independent air elements attached. Their is not way on this green earth that Japan could have advanced farther than a few hundred miles inside this inhospitable territory w/o logistics at least as good as the American army. Japan was not capable of holding long lines and pushing deep in forest and rugged terrain. They considered that option and was already concluded it was not worth the risk of long term campaign sapping Japans limited resources, nor did it solve any short or long term solutions for Japanese resources for her war economy.
The territory only offers one warm water port and the rest is a barrier of 5,000 miles of dense forest and hard core Soviet mechanized and well equipped infantry.
Thats why the Axis and Allies game is so flawed, because Japanese tanks cutting thru 1 billion people of India, I billion people of China and Huge mountain ranges and tundra/forest/swamps of 5,000 miles would NEVER allow all these mystery tanks rolling on Moscow from the east.
The only plausible point they could have gotten was a complete bypass of India and landing in Saudi Arabia/Iran heading to the oil in Persia. They could not even capture China which was one of the most backward nations. China was still binding womans/children’s feet which is medieval and STILL held up Japan from 1931-1945.
The lack of Siberian troops around Moscow in the period Sept 1941-Dec 1941 would not have led to Germans occupying Moscow, because the mistake was already made before in August when Hitler lost the plot and diverted AGC major Panzer units to assist AGS envelopment of Kiev pocket. That loss of time allowed the Soviets to build 5 defensive earthworks protecting Moscow and Stalin only had to fill in the gaps with fodder troops. The winter would have done the rest. The only thing was he would not have the offensive power to launch that counterattack on Dec 6th 1941 and would have to sit till spring, but that was a disaster anyway.
So to sum up the prior German mistakes could not be saved by some tricks with Japan going against Vladivostok because these were critical mistakes made in the original decision to bring victory in 1941. Germany didn’t have the means to fight wars longer than 6 months, all her previous victories were “on the cheap” and you only had to get the Germans outside their comfort zone with a war of attrition against a nation that didn’t fully mobilize for total war.