Russian Patriarch Kirill celebrates the Russian Orthodox Christmas service at Christ the Savior Cathedral in Moscow late on January 6, 2019. - Orthodox Christians celebrate Christmas on January 7 in the Middle East, Russia and other Orthodox churches that use the old Julian calendar instead of the 17th-century Gregorian calendar adopted by Catholics, Protestants, Greek Orthodox and commonly used in secular life around the world. (Photo by Mladen ANTONOV / AFP)