Armenia-Azerbaijan war 1991-94
Armenia and Azerbaijan announce agreement to end battle over Nagorno-Karabakh region

As per the deal mediated by Russia, Armenia will withdraw its forces from the Nagorno-Karabakh region. Russia will also deploy a peacekeeping force for a period of five years

The regional dimensions of Nagorno-Karabakh conflict

Except for Turkey, no other regional or global power has declared its direct involvement in the conflict. However, it has all the ingredients of turning into a major conflict unless negotiations take place