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A man closes a shutter with graffiti reading: "Kosovo is Serbia" in Belgrade, Serbia, Friday, April 19, 2013. Serbia and Kosovo reached a potentially historic agreement Friday to normalize relations between the Balkan neighbors, end years of acrimony and put them both on a solid path to European Union membership. The tentative deal culminated months of tense negotiations and showed determination of both Serbian Prime Minister Ivica Dacic and Kosovo Prime Minister Hashim Thaci, said EU negotiator Catherine Ashton. (AP Photo/Darko Vojinovic)