5 largest cities in country subdivisions

The Top 5 largest cities in first-level subdivisions. Part 1 is about the "European Giants" (UK, France, Italy, Spain, Germany), Part 2 is about the Eastern Slavs (Russia, Belarus, Ukraine), Part 3 is about the Visegrád Group (Poland, Czechia, Slovakia, Hungary) and Part 4 is about two Groups (Austria, Switzerland, Liechtenstein plus BeNeLux).