Traitorfish
The Tighnahulish Kid
Yes and no; language is an important medium of cultural exchange, but, in itself, is ultimately secondary. The Bretons and Welsh, for example, speak languages far more closely related to each other than to anything else, yet both share more culture with their larger neighbours, France and England, respectively, than they do with each other. Similarly, the non-Indo-European speaking Basques share more culture with Spain than the Romance speaking French, the Magyars of Hungary share more culture with Austria and Slovakia than with their Finno-Ulgric cousins in Finland and Estonia, who themselves align themselves more closely with Sweden than with anywhere else.Don't know exactly what you mean - language is important part of culture.
Linguistic relationships tend to represent, rather than instigate shared culture; they usually represent the adoption of a non-native language (such as the adoption of Irish by English) or shared historical roots (such as the related cultures of Czechia and Slovakia).
Anyway, as TheLastOne noted, the West and East Slavic languages diverged over fifteen hundred years ago; while their may indeed be some residual cultural links with Eastern Slavic Europe, they would be no prominent that those between, say, the Low West Germans of England and the High West Germans of Germany, which we identify as Western and Central Europe, respectively, and probably far less so, given the deep religious divide between the two, and the lack of significant economic and political links until the modern era.