Serbia braced Monday for a protracted political showdown after the pro-Western coalition that declared victory in Sunday’s parliamentary elections immediately faced a challenge from nationalist rivals who vowed to team up to form a government. President Boris Tadic, leader of the moderate Democratic Party, which supports Serbia’s integration into the European Union, said Monday he had received a strong mandate after winning about a 10 percent lead over the far-right Radical Party, led by Tomislav Nikolic, which wants Serbia to strengthen ties with Moscow and China. Full Story