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 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.

Armenia and Azerbaijan have announced that they have agreed on the terms of a peace treaty to end nearly four decades of conflict. The South Caucasus countries are expected to provide a timeline for signing the deal,

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.