Serbia withdrew its forces from Kosovo 13 years ago, but have supported a sort of Serbian parallel government in northern Kosovo. Now Serbia is telling Serbs there to vote in the Kosovo election, and many Serbs see that as a betrayal.
Christopher Hill, US ambassador to Iraq from 2009 to 2010, says while things were learned from the US intervention in the Balkans, the situation in Syria is quite different.
The European Union requires candidates for membership to have peaceful relations with their neighbors. Twelve years after the Kosovo War, the governments of Kosovo and Serbia are trying to normalize relations.