[RonDog]

And from www.orthodoxworld.ru:

The cupolas of the Kremlin

[RonDog]

And from www.byzantines.net:

...Following the capture of Muslim Kazan by Tsar Ivan IV in the 16th century the custom arose in Moscow and the other cities of Russia to place atop cathedrals and churches the cross over the inverted crescent moon as symbol of the triumph of Christianity over Islam...