Sèvres syndrome
The Sèvres syndrome (Turkish: Sevr sendromu) refers to a popular belief in Turkey that dangerous internal and external enemies, especially the West, are "conspiring to weaken and carve up the Turkish Republic". The term originates from the Treaty of Sèvres of the 1920s, which partitioned the Ottoman Empire among Armenia, Greece, the United Kingdom, France, and Italy, leaving a small unaffected area around Ankara under Turkish rule; however, it was never implemented since it was left unratified by the Ottoman Parliament and due to Turkish victory on all fronts during the subsequent Turkish War of Independence. Turkish historian Taner Akçam describes this attitude as an ongoing perception that "there are forces which continually seek to disperse and destroy us, and it is necessary to defend the state against this danger".
This belief is often described as a conspiracy theory, and has been likened to fostering a siege mentality among certain members of Turkish society.