The easiest way to reach the Kremlin is to take the metro on the dark-green line and travel two stops north from Paveletskaya to Teatralnaya. Then exit onto Manezhnaya Ploshchad and the Kremlin is just over five minutes' walk from there (or change to the red line and travel one stop further west to Biblioteka im. Lenina, which can be exited right opposite the main visitor entrance to the Kremlin).
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