Actually, there's no nickname. 'Moscow' is pretty short, no need to create a separate word, like with St. Petersburg which we simply call "Peter"
Nick Kulyohin was born on November 7, 1983, in Moscow, Russia, USSR.
Moscow.
Moscow is a capital, Russia is the Country.
Nick Afanasiev was born on July 29, 1989, in Moscow, Russian SFSR, USSR [now Russia].
Kremlin is the name of Russia's capital building.
Moscow
Moscow is in Russia. It is the capital of Russia.
Proper. It is a name of a city in Russia.
Moscow
The capital of Russia is Moscow.
Moscow is the capital city of Russia.
Moscow is the capital city of Russia. It does not have a capital.Moscow is a city and not a country. Moscow is the capital of Russia.