When Kosovo declares its independence on Sunday, the territory’s veteran guerrillas will celebrate by flying the traditional black-and-red eagle flags that unite ethnic Albanians everywhere. The fighters who clashed with Serbia’s security forces in 1999 will unfurl the banners over homes, shops and petrol stations. In the south, they will hang a huge flag over the picturesque Kacanik Gorge, the link from Kosovo to Macedonia and the rest of the Balkans.