In September 1991, the Republic of Macedonia also declared independence, becoming the only former republic to gain sovereignty without resistance from the Belgrade-based Yugoslav authorities. 500 US soldiers were then deployed under the UN banner to monitor Macedonia's northern borders with the Republic of Serbia. Macedonia's first president, Kiro Gligorov, maintained good relations with Belgrade and the other breakaway republics and there have to date been no problems between Macedonian and Serbian border police even though small pockets of Kosovo and the Preševo valley complete the northern reaches of the historical region known as Macedonia (Prohor Pčinjski part), which would otherwise create a border dispute if ever Macedonian nationalism should resurface (see VMRO).