Neutral point of view 

Hi and thank you for your welcomes. Please explain me is telling a fact ruining Wikipedia neutral point of view? Didn't Kosovo war occur in south part of Serbia, in Serbian province Kosovo (Kosovo is Serbian word too)? Then if I say Berlin is German I 'm ruining neutral point of view. Thank you again, and please answer me, I changed because I don't want people to think about Serbian land as about independent states.