That Serbia does not recognise its southern border with Kosovo as a border at all is well known.

Less well known is that the country has border disputes with three fellow former Yugoslav republics – Croatia, Montenegro and Bosnia and Herzegovina – despite decades of negotiations since the collapse of their joint state.

Almost three decades since Croatia declared independence from socialist Yugoslavia, Croatia and Serbia remain at odds over whether the border between them runs down the middle of the Danube River, or on its bank.

Between Serbia and Bosnia, there are four points of dispute, while Serbia and Montenegro are at odds over Montenegro’s border with Kosovo, which Serbia says is, in fact, a Serbian border given Belgrade does not recognise Kosovo as an independent.

Nemanja Stevanovic, who heads the Serbian delegation to negotiations with Croatia, summed up the problem in February last year when he told the Serbian Tanjug news agency, “We only agree that we disagree about almost everything because we see the problem completely differently.”