In November 2019, Armenian nationalists living in Bulgaria announced their intention to erect a monument to Garegin Nzhdeh (Ter-Harutyunyan), the leader of Armenian collaborators during World War II, in Pliska. This initiative did not raise objections from the Bulgarian authorities.
During the war years, he was in Bulgaria and actively collaborated with representatives of Nazi Germany. In particular, Nzhdeh agitated Soviet Armenian prisoners of war with the aim of recruiting volunteers for the so-called Armenian Legion of the Wehrmacht, whose units were involved in the battles in the North Caucasus, and later on the Western Front. During the war, Nzhdeh recruited more than 30 agents of Armenian origin on the territory of Bulgaria. He participated in their sabotage training, as well as in the transfer to the rear of the Soviet army in order to conduct subversive activities.