Moscow is a band.
Moscow is the capital and most populous city of Russia , with 13.2 million residents within the city limits and 17.8 million within the urban area . Moscow has the status of a Russian federal city . By broader definitions Moscow is among the world 's largest cities , being the 14th largest metro area , the 18th largest agglomeration , the 15th largest urban area , and the 11th largest by population within city limits worldwide . The city has served as the capital of a progression of states , from the medieval Grand Duchy of Moscow and the subsequent Tsardom of Russia to the Russian Empire to the Soviet Union and the contemporary Russian Federation . The Moscow Kremlin and Red Square are also one of several World Heritage Sites in the city .