EU's Mogherini booed in Serbian parliament ahead of Balkan summit

By Ivana Sekularac and Gabriela BaczynskaBELGRADE/BRUSSELS (Reuters) - Nationalist Serbian lawmakers booed the European Union's top diplomat Federica Mogherini on Friday as she addressed their parliament during tour aimed at addressing concerns about rising tensions in the Balkans.Several EU leaders have expressed alarm at a variety of problems there and some blame Russia for seeking to destabilize the region, EU officials say.At Mogherini's speech to the Serbian parliament, members of the Serbi