I'm a student of formal linguistics and Russian language, my question has been surprisingly hard to google -- I've studied a little Ukrainian, and I've read that its structurally similar to Russian but has absorbed a lot more of its vocab from Polish, supposedly a hugely influential culture at one time in Ukraine's history?
I was wondering if anybody could tell me whether there is any specific source (aside from English, Latin, Greek) that Russian had historically absorbed a lot of vocab from, or whether there were any specific national languages that had absorbed huge amounts of vocab from Russian?
Thanks for the help