Azerbaijan has accused Armenian forces of firing on its positions from Armenia's southern Syunik province. This accusation follows recent negotiations between the two nations, agreeing to a peace treaty aimed at ending decades-long conflict.

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.

Armenian and Azerbaijani officials said on Thursday that they had agreed the text of a peace agreement to end nearly four decades of conflict between the South Caucasus countries, a sudden breakthrough in a fitful and often bitter peace process.