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 agreed on the text of a peace agreement, potentially ending over 35 years of conflict, though Azerbaijan has set several preconditions before signing.