Germany lost when it attacked Russia. At that point, absent a breakdown by Stalin or a putsch , Germany had lost.
As we agree, Japan lost when it hit Pearl harbor.
Now, I found a interesting turning point.
Zhukov was recalled to Moscow to be part of the NKVD purge. He ran into a old mentor of his, a fat, old totally incompetent Soviet marshal, who just happened to be a buddy of Stalins*. He rescued Zhukov and sent him back to the East to defend against Japanese aggression. At that point in time, the Imperial Army was divided between a Northern Strategy and a Southern one (into China from Kwantung, which is what they ended up doing, which was a disaster).
Now Zhukov was a military genius, likely the only one left after the purges. He risked it all in a brilliant attack Battle of Khalkhyn Gol . This beat the Japanese completely, so they abandoned the Northern Strategy.
Now, lets do a hypothetical. Zhukov doesnt meet that Marshal. He is purged. Some lesser commander is in the East, and gets whupped by the Japanese. The Imperial army continues going North. The doctrine of Nanshin-ron, promoted by the Navy, which took its focus southward, eventually leading to its war with the United States and the Western Allies, never happens. The Embargos never happen.
Meanwhile, in 1941 Germany invades the USSR. Russia now has the war on two fronts, and no Marshal Zhukov to command.
I think this means Russia falls.
Meanwhile, altho America does send aid to GB, it never enters the war.