Kosovo’s prime minister on Wednesday dismissed Serbia’s fierce opposition to the province’s drive for independence, insisting that decades of bloodshed in the Balkans are over and Serbs will never dare to invade Kosovo again because they have “no courage.” In an interview with The Associated Press, Agim Ceku condemned a recent spate of bombings — including an attack late Tuesday that injured four Serbs — and he blamed Serbian nationalists for using “primitive propaganda” to incite ethnic tensions as the United Nations nears a decision on possible statehood for Kosovo.