In ex USSR we celebrate New Year. So the first several years of remote work with Western folks, I was always surprised to see no colleagues some day in December. Only later in the evening, I would remember they had Christmas that day. :)
Yes. But Lithuanian and Latvian are Catholics are Roman and protestants in all three are on new calendar (not sure if any protestants use old calendar at all?). And not all catholics outside of baltic states were unites. E.g. western Belarus and western Ukraine has some Roman Catholics. IIRC there’re some Roman Catholic islands inside RF too, but they are tiny. Probably mostly artifacts of forced resettling in Soviet or tsarist eras.
They did celebrate it before, but on January 7th (which on Julian calendar is December 25th, because it lags 14 days). This year their Orthodox church switched to Gregorian calendar.
Not the original poster, but I visited Almaty and Shymkent in Kazakhstan this summer. I met a lot of nice and warm Kazakh people. Would love to visit Almaty again and explore other parts of the country this time.
Merry Christmas!