Question is, why don't the Serbs reestablish the concertina wire themselves? Would solve the problem in the long-term, but short-term would create a barbaric response from the KPC/KLA.
Where would Serbs get concertina?? From KFOR? Not too likely. KFOR including US forces have been tools of the KLA since first arriving in Kosovo in 1999. Their first mission was to go house to house in Serb neighborhoods and confiscate all weapons....making Kosovo safe for muslim terrorists.