Yes, but that is a coincidence. Russians celebrate Christmas on December 25th like everyone else (except some norther Europeans, we celebrate on the eve), it's just that their view of when it is December 25th differs.
Yes, it's a coincidence, that's why I find it curious :)
Christmas in Russia is celebrated on 7 January
My point was that no, the holidays are celebrated on the same dates throughout the Christian world, but depending on which calendar you use those dates fall on different days. Today for example it's August 10th in many Orthodox churches, while most others would say it's the 23rd.