Treaty of Neuilly-sur-Seine
Attack insists on the cancellation of Treaty of Neuilly-sur-Seine and the returning of the Western Outlands to Bulgaria, annexed by Yugoslavia after the First World War, which consists of the regions of Dimitrovgrad and Bosilegrad in Serbia, whose population according to the Serbian national census is predominantly ethnic Bulgarian, and of the region of Strumica in Republic of Macedonia. Siderov said that the treaty is invalid, because it was signed with Yugoslavia in 1919, a vanished state, and does not refer to the present-day Serbia or to the Republic of Macedonia and should be cancelled.