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

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.

Armenia and Azerbaijan agreed to the terms of a long-awaited peace treaty Thursday that could end a decades-long conflict that began with the fall of the Soviet Union.