Both Orthodox and Catholics celebrate the birthday of Christ on December 25, but they do it according to different calendars. In the West - according to the Gregorian and New Julian, and, for example, in Russia, Georgia, Serbia - according to the Julian calendar.
Every year on January 7, the birth of Christ is celebrated in the following countries:

Egypt;
Belarus;
RF;
Georgia;
Serbia;
Macedonia;
Montenegro;
Kazakhstan;
Kyrgyzstan.
Apart from Ukraine, Christmas is celebrated twice in Moldova, Belarus, Eritrea, Lebanon.
Therefore, soon Ukraine will celebrate Christmas only on December 25th. For this, the churches of Ukraine are given 10 years to transition!