Unlike Abkhazia and South Ossetia, in Nagorno-Karabakh the conflict opposing Armenians and Azerbaijanis is still frozen since the ceasefire of 1994. In December 2007 the mediating efforts of the United States, France, and Russia (the co-chairs of the OSCE Minsk Group) produced the so-called Madrid Principles, based on the return to Azerbaijan of most of the territories under Armenian control, security guarantees for the Nagorno-Karabakh and a referendum to determine the final status of the area. Despite the opposition of Baku, the recent developments of Turkish-Armenian relations could open new perspectives for the full settlement of the conflict.