David Flin
Gone Fishin'
The sitzkrieg with the UK scenario would probably not have much effect on the Eastern Front in 1941. Assuming that the Italians can be persuaded not to precipitate a conflict with the UK, the primary differences would be - 1. diversion of resources from the Med front to the Eastern Front, 2. less submarine construction, 3. less need for defending coastal areas, 4. less damage from bombing and fewer resources devoted to defense against bombing, 5. more possible support from Finland and conceivably Turkey, and 6. possibly an earlier start due to the absence of the Balkan diversion (I am not sure about this - there are arguments that an earlier start was impossible due to weather conditions and I haven't evaluated those arguments).
1. Diversion of resources from Med to Russia. How significant a difference would that actually make? The numbers of tanks, infantry, artillery and planes would be trivial compared to what's already there; the problem wasn't the number of troops, it was supporting them. Any trucks would have been far more important and I have been advised that no North Africa means no captured British trucks which formed a significant proportion of German logistics anyway. So, stuff all difference, in effect.
2. Less submarine construction means less trouble in the Atlantic for Britain, which means more stuff gets through more easily. Which means build-up in UK proceeds faster.
3. Less need to defend coastal areas. That implies Italy will be hung out to dry. That could easily result in Italy switching sides earlier than OTL.
4. Huh? Why on earth would Britain, less troubled in North Africa and able to devote more resources to building up a bomber fleet, bomb Germany less? That's counter-intuitive, to put it mildly.
5. More support from Finland? You'll have to explain the logic there to me. Why would a larger German investment into resources for Barbarossa mean more support from Finland. There's a step or two in that logic train that I'm just not seeing. More support from Turkey. Right. Without German involvement in the Med, the Med has become a de facto British lake. That becomes a problem for Turkey if Turkey becomes a German co-belligerent, as it becomes a valid target for British activity. As Britain has forces that were earmarked for North Africa that are now rattling about looking for something to do, that becomes a problem for Turkey. The Turkish leadership stayed out of things for very good reason, just like Spain did.
6. The troop movements and the weather are quite clear. The myth that the Balkans delayed the launch of Barbarossa is just that - a myth.