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It appears to be Brenthisino (Rottemburg, 1775) (Mother-of-pearl meadowsweet)
It turns out that the species is found in the West Caucasus regions
Stygioides Bruand, 1851 - on the website there is no pervoopisatel
I am inclined to think that this is - Lemyra jankowskii (Oberthur, [1881] 1880) (as V. Dubatolov).