It is pronounced different because "Belarus" means "white Russia" [from Russian "белая" (belaya) and "россия" (rossiya)] and in Ukrainian white is spelled as "біла" (bila) so therefore spelling of Belarus is Bilorus In Ukraine it is pronounced "bee-loh-rroos"(also, I gave the colours in feminine form)
In Ukraine it is pronounced "bee-loh-rroos"
(also, I gave the colours in feminine form)