A pejorative meaning of the word began to develop in the Viking Age, but is clearest in the medieval Icelandic sagas, written two or three centuries later â in the 1300s and 1400s.
The Ukrainian is a cyrillic alphabet, not latin, so it is similar to other Eastern Slavic alphabets (including Russian). While many letters are similar, most slavic languages have letters that are unique to their alphabets. The Russian alphabet includes such letters as Ñ, Ñ, Ñ, Ñ, the Ukranian one doesn't include these letters.
I think Western Slavs are 'less Slavic' more than Russians - Czech or Poles use Latin Alphabet and we all know that Latin came from Italian Peninsula, from completely different culture. Cyrillic is specifically reserved for Slavic. Russia, Serbia and Bulgaria use it, for example.