@Kaarme
To be fair, there was quite a lot of military cooperation between the Soviet Union and the Weimar Republic prior to the war. And after the purges they were in quite a lot of disarray.
Who knows, maybe they'll be crushed but the chieftain will be interested in the strange light skinned non-neanderthals and their constructions. Keeping them alive.
@xiso But doesn't isekai mean it has to be a new world? A different timeline is still the same world, just with changed actions and the results of those.