Which person was the head of government of XXX?
Serbia
Serbia (i/ˈsɜːrbiə/, Serbian: Србија / Srbija, IPA: (sř̩bija)), officially the Republic of Serbia (Serbian: Република Србија / Republika Srbija), is a sovereign state situated at the crossroads between Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans.