Armenian Prime Minister Nikol Pashinyan has briefed Russian President Vladimir Putin on a finalised draft peace agreement wirh Azerbaijan in a phone call, the Armenian government said on Friday.

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.

Armenia and Azerbaijan have fought a series of wars since the late 1980s, when Nagorno-Karabakh, a region in Azerbaijan that had a mostly Armenian population at the time, broke away from Baku with Yerevan's support.