How do Russians celebrate Christmas?

Russians celebrate Christmas on 

It’s based on the Julian calendar

because the dates for Christmas and other holidays differ between the Julian and Gregorian calendars

Christmas Eve: Celebrated on

Holy Supper: A meal with 12 dishes, representing the 12 Apostles

Church services: The family attends Christmas Mass on Christmas Eve and the Christmas day Liturgy on Christmas morning

Gift exchange: After dinner, the family opens presents

Carolling: Children go door to door singing "Thy Nativity"

Christmas tree: A family tradition to decorate a Christmas tree with ornaments