MITROVICA, Kosovo — The challenge for President Aleksandar Vucic of Serbia was steep: Visiting a neighboring country whose sovereignty he does not recognize, addressing a group of people deeply distrustful of his intentions and talking about an assassination that remains unsolved.

In a hastily arranged visit that came on the heels of the daytime slaying of a moderate Serb politician, Oliver Ivanovic, Mr. Vucic vowed over the weekend to protect ethnic Serbs living in Kosovo, a land still reeling from Balkan wars of the 1990s, even as he called for calm.

See at: https://www.nytimes.com/2018/01/21/world/europe/serbia-kosovo-aleksandar-vucic.html?smid=tw-share