Arguably Russian Winter by itself won the war. I do not know if Japanese actually understood that attacking Russia from their front was futile at that time due

Arguably Russian Winter by itself won the war. I do not know if Japanese actually understood that attacking Russia from their front was futile at that time due to several reasons. 1. Russia is big, very big. Traversing Siberia would have taken a long time. Something that they would have to do without any naval support. Can you imagine trying to establish supply lines through Siberia? 2. Add continental winter on top of that and you get no go on Japanese invading USSR. (Temperatures of 15-20 degrees centigrade colder than people living near the ocean are used to). 3. Because China would obviously sit very still, when large portion of Japanese ground forces would be absent. 4. Remember no naval support? Attacking Russia would effectively split Japanese fleet and ground army. I do not know if Japanese understood those simple facts, but Russians sure did. European front was way higher priority than Siberia. An if Japanese did attack, an order of magnitude smaller, more mobile force would had been enough to harass supply lines and stall any progress. It is not only winter time that would have been problematic, when snow melts things are worse for a while due to all the mud. Similar story with Germans, it is not that Russians in monumental effort stopped the advance. They merely stalled German blitzkrieg (while taking heavy losses), and continental winter stopped it. I am not trying to take away from monumental effort thrown by soviets to stop the advance, but ultimately all it came down to: Germans could not advance and adequately deliver supplies and Russians could due to intact railroads. * I am not saying those were only reasons, but people tend to underestimate importance of supply lines and role of winter.