By Aleksandar Vasovic BELGRADE (Reuters) – The United States supports Serbia’s intention to pursue an international plan to normalise ties with Kosovo and eventually join the European Union, the U.S. ambassador to Serbia said on Tuesday. “It’s really about Serbia’s future and about relationships that Serbia needs,” Christopher Hill told reporters in Belgrade, capital of the Balkan country, an ally of Russia. Both Kosovo and Serbia aim to join the European Union and in order to complete that process, both parties need to resolve outstanding issues and build good neighbourly relations. President…