So, let 'em fight, then.
The Serbs have been neutered by their recent defeats, militarily speaking, and being surrounded by NATO States or NATO candidate States doesn't really help matters, as far as their being able to recreate the vast arsenals of military stores which fueled Serbia's recent military misadventures.
So while they or their booster club can talk a mean fight, they're pretty much all hat and no cattle at this point.