Red Square is a city square in Moscow Russia. It separates the Kremlin the former royal citadel and now the official residence of the president of Russia from a historic merchant quarter known as Kitai-gorod. Red Square is often considered to be the Red Square is a city square in Moscow Russia. It separates the Kremlin the former royal citadel and now the official residence of the president of Russia from a historic merchant quarter known as Kitai-gorod. Red Square is often considered to be the central square of Moscow since the citys major streets which connect to Russias major highways originate in the square.