Here are the correct matches for the leaders to their respective countries:
- Italy: 2. Benito Mussolini
- Russia: 3. Joseph Stalin
- Japan: 4. Emperor Hirohito
- Germany: 1. Adolf Hitler
- United States: 5. Franklin Delano Roosevelt
So the matched pairs are:
- Italy - Benito Mussolini
- Russia - Joseph Stalin
- Japan - Emperor Hirohito
- Germany - Adolf Hitler
- United States - Franklin Delano Roosevelt