Which person was the head of government of XXX?
Montenegro
Montenegro (i/ˌmɒntᵻˈneɪɡroʊ/ MON-tən-AYG-roh or /ˌmɒntᵻˈniːɡroʊ/ MON-tən-EEG-roh or /ˌmɒntᵻˈnɛɡroʊ/ MON-tən-EG-roh; Montenegrin: Crna Gora / Црна Гора (t͡sr̩̂ːnaː ɡɔ̌ra), meaning ``Black Mountain'') is a sovereign state in Southeastern Europe.