Christmas in Ukraine is celebrated January 7 according to the Gregorian calendar as in most of other Orthodox Christian countries.
During the Soviet time it was not officially celebrated in Ukraine. Instead communist government tried to substitute Christmas with the holiday of New Year. But people did not forget their traditions. After gaining it’s independence in 1991 Ukraine started to celebrate Christmas officially as well.
http://www.google.com.ua/url?sa=t&rct=j&q=christmas%20in%20ukraine&source=web&cd=1&sqi=2&ved=0CC4QFjAA&url=http%3A%2F%2Fwww.uazone.net%2Fholidays%2Fchristmas.html&ei=oikHT6uAC_SM4gThmLiRCA&usg=AFQjCNHyg7PFChxo235Ys6DO8ItWjbEmgg