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By late March 1941 the Italian campaign in Greece had come to a stalemate and the failure of the Italian Spring Offensive had frustrated Mussolini...
However on 6 April 1941 Germans attacked Greece (after some pleas by Mussolini and for some other reasons) and forced the army to capitulate.
Is it possible that Hitler declined to help Mussolini? He could go like "Its your mess you clean it up"
What happens next? Germans launch Barbarossa earlier and Italians make a hasty peace leaving Greece return to its previous neutral status?