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The Soviet Union
Luxembourg (the city) is the capital of Luxembourg (the European country). In other words, the same name is used for both.
Vatican City is the least populated country in Europe and the world, with about 800 citizens.
Luxembourg is a country, but there is a Luxembourg City.
He can turn his name into anything he wants to. That includes European Country.
Luxembourg, Luxembourg San Marino, San Marino Vatican City, Vatican City Monaco, Monaco Andorra la Vella, Andorra
The City/State/Country is called "Monaco", it's the only city, state, and country with the same name.
Same as the country's name: Djibouti. It's also the largest city.
Portugal. In the olden days, there was also a kingdom called Prussia.
Hungary
Canada
Both. Liberia is the name of a country in West Africa, but also the name of a Costa Rican city.