But hurdles remain. Azerbaijan also said Armenia’s constitution must “eliminate the claims against the sovereignty and territorial integrity of Azerbaijan,” as a prerequisite to allow for the signing of the peace treaty.

Azerbaijan and Armenia said Thursday that they had wrapped up peace talks aimed at resolving the Caucasus neighbours' decades-long conflict, both sides having agreed the text of a possible treaty.

Armenian Prime Minister Nikol Pashinyan and Russian President Vladimir Putin speak at a summit of leaders of nations, which are members of the Commonwealth of Independent States (CIS), at the Kremlin in Moscow,