An interesting article on stonechats in the Caucasus questions the recent changes in taxonomy of Caspian and Armenian Stonechats.
V.M. Loskot & G.B. Bakhtadze. 2020. Distribution, systematics and nomenclature of the three taxa of Common Stonechats (Aves, Passeriformes, Muscicapidae, Saxicola) that breed in the Caucasian region. Zoosystematica Rossica, 29(1): 33–57.
See the abstract here - http://zin.ru/journals/zsr/content.asp?year=2020
Plus a quote from the paper. "In the last decade, some propositions were published involving a radical change in views on the type locality of S. m. variegatus, boundaries of the breeding area of S. m. armenicus, and the nomenclature of both these taxa (Mlikovský, 2011; Svensson et al., 2012; Shirihai & Svensson, 2018). Opaev et al. (2018) noted that these statements are unwarranted but did not present substantial evidences thereof; here we clarified these issues."
It appears that we may go back to variegatus for Caspian and armenicus for Armenian.