For the first time since 1917, Ukraine is celebrating Christmas on 25 December.
The move is more than just a change of date from 7 January - the date for Christmas in the Julian calendar, which Russia uses.
It's the continuation of a significant cultural shift in the country - the latest attempt to eradicate Moscow's influence in Ukraine.
The adoption of the Western, Gregorian calendar is also a sign of Kyiv's continuing bid to align itself with Europe.
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