Language /
Polish v Russian - similarity [17]
In this sense, Polish is virtually a 'typical' Slavic language for most of the reasons Sascha and the rest have mentioned. Polish differs phonologically from Russian, especially the South and East Slavic languages, showing a greater affinity in this way with Czech, but curiously NOT with Ukrainian! The latter has word stock all but identical with Polish, its pronounciation however is much closer to Russian. Polish stands separate from the rest of its family in the survival of those nasals 'ą' and 'ę', all but abandoned by the other extant members of the Slavic group! In addition, its palatalized and dental consonants are nowhere nearly as clear as in, say, Russian.
Moreover, in much base vocabulary, Polish is understandably more Westernized, drawing heavily from French, German, Italian, i.e. Latin, even Yiddish-:)
Another thing. Polish aspect is more productive than Russian, owing in large part to those foreign root verbs which take prefixes, notably 'za', f.ex. 'ZAinteresować', etc.