Armenia and Azerbaijan were locked in conflict over Nagorno-Karabakh for nearly four decades after the Soviet Union they were both members of collapsed.

After decades of conflict, Armenia and Azerbaijan have agreed to the text of a peace treaty. Plenty of hurdles remain before it can be signed.

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 The Azerbaijan Republic have reached an agreement on a peace treaty, marking a significant step toward ending nearly four decades of conflict between the two former Soviet republics, officials from both countries announced on Thursday.

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.

Armenia and Azerbaijan have finalized the text of a peace agreement, marking a breakthrough in efforts to end nearly four decades of hostilities over Nagorno-Karabakh. Both countries confirmed on Thursday that

The two South Caucasus nations, former Soviet states, have fought multiple wars since the 1980s when Nagorno-Karabakh, an ethnically Armenian region broke away from Azerbaijan.

Iran has welcomed the announcement of a potential peace agreement between Armenia and The Azerbaijan Republic, aiming to end nearly four decades of conflict.

The European Union says conclusion of Azerbaijan and Armenia talks and agreement on the text of a possible treaty, "a decisive step."

Armenia and Azerbaijan were locked in conflict over Nagorno-Karabakh for nearly four decades after the Soviet Union they were both members of collapsed. Here is a look at the history of the conflict and the latest developments as Armenian and Azerbaijani officials said on Thursday that they had agreed the text of a peace agreement.