Ukraine->Russia, Belorussia->Russia = "москаль" (someone from "москва"-moscow), "кацап" ("цап" is ukranian "goat", "как цап"=someone ugly with beard. in ancient ukraine men shave face, leaving only topknot of hair)
Russia->Ukraine = "хохол" (see above. traditional urkranian topknot of hair - хохолок)
Russia->Belorusia = "бульбаш" (from "potato" in belorussian - "бульба", big income of belorussian economy)