This is what makes nationalism very stupid.
I think that crucial thing for Serbia is the concept of citizenship, not national key. For me it's not matter is this guy Albanian, Croatian, Hungarian or Slovakian if he loves his country, and that is Serbia.

I would give a hand for my neighbors from childhood, and they're one Hungarian and one Slovakian.

And they showed to be severe better people and more loyal to their country then many "Serbians" are. And that makes one man a true patriot.