The majority-Armenian populated Nagorno-Karabakh region in the southwest of Azerbaijan occupied by Armenia in 1991, but it is not diplomatically recognized by any nation and is still considered a "de jure" part of Azerbaijan.
The majority-Armenian populated Nagorno-Karabakh Republic declared independence in 1991, Azerbaijan claims it as part of its territory. It is "de facto" independent but not diplomatically recognized by any nation and is still considered a "de jure" part of Azerbaijan.