"I'd kill him if I could," shouts the shopkeeper, cheerfully, in the main town of northern Kosovo.

He is watching police dogs snuffling about the drab municipal building on the Serbian, northern side of the divided town of Mitrovica, preparing for the visit of Aleksandar Vucic.

Serbia's first deputy prime minister is the most popular politician in his home country, with an approval rating that hovers above 70%, but among the Serbs of north Kosovo, his name is mud.

In April, Mr Vucic was one of the key figures behind an agreement to normalise relations that Serbia made with Kosovo. It covered a range of issues but the most controversial, and difficult to settle, was the future of north Kosovo's ethnic Serb population.

It has refused to recognise the authority of the majority-Albanian government in Pristina which unilaterally declared independence from Serbia in 2008. Instead, with financial support from Belgrade, Serbs have run their own "parallel institutions" in key areas like justice, education and healthcare.

Under last month's "Brussels agreement", these would go. Instead the Serbs would have a degree of autonomy within the main Republic of Kosovo system. For people who still consider themselves Serbian - with car number plates, identity cards and school certificates all issued by Serbia - this is an unacceptable situation.

"Most of the people are afraid and feel betrayed by the Serbian government," says Aleksandar Arsic, a teacher at a vocational high school in Mitrovica.

"They said they would protect us - but this is not the way to do it."