What if the Soviet Union would have already fully constructed the Molotov Line by June 1941 and also aggressively manned it when Operation Barbarossa would have started? :
Just how much slower would the Axis advance in Operation Barbarossa have been in such a scenario? And how would Operation Barbarossa in general have looked like in this scenario?
Molotov Line - Wikipedia
en.wikipedia.org
Just how much slower would the Axis advance in Operation Barbarossa have been in such a scenario? And how would Operation Barbarossa in general have looked like in this scenario?