Kosovo has asked NATO troops to airlift a former Serb policeman who was detained two weeks ago but could not be transported to another facility because local Serbs demanding his release set up barricades to prevent his transfer. Dejan Pantic was arrested on December 10 for allegedly assaulting serving police officers during a previous protest. Tensions have been running high since then as thousands of Kosovo Serbs protest demanding the country’s Albanian-majority government pulls its police force out of the north, where the Serb minority is concentrated. Local Serbs, who number around 50,000 i…