If you look at the timeline of World War II concerning Germany and leading up right up to Germany’s defeat, you may notice that Greece factors into this timeline of events. On October 28, 1940, Iannis Metaxas told Mussolini that under no circumstances would he agree to an Italian occupation of Greece. Because of this rejection, Mussolini invaded. This event is the basis behind Ochi Day, a national holiday in Greece.
There are many who believe that Italy’s insistence on invading Greece ultimately led to Germany’s defeat in Russia, which eventually ended the war. Whether or not this is actually true is under debate.