I didn't know:
In January 1941, Stalin organised 2 “Kriegspiel” focused on defence and the other on counter-offensive. The German Forces are under Zhukov command who defeated he Soviet under Pavlov.
Zhukov will take Mereskov’s chair as Chief of the STAVKA and informed Stalin he will need 2 years to reorganise the Soviet Forces. Stalin gave him one.
Find this in a French What If: What If France didn't surrender in May 1940...