Upvote:4
I can't find any scholarship that really touches on this question, which honestly leaves me a bit skeptical.
A caption under this image in the Wikipedia article on "Crimean Goths" claims that it shows "Indo-Scythians/Εaka/Sarmatians on Crimea" but the footnotes provided don't support this.
It is true that Scythians and Sarmatians both had a historical presence in Crimea. This article lists them among many other groups to had a religious influence at some point in the region.
Crimea is an exceptionally interesting research area for religious studies scholars. This rather small region (25,900 km2) has been home to - one after the other or at the same time - Tauri, Cimmerians, Maeotae, Scythians, Greeks, Sarmatians, Romans, Goths, Byzantines, Jews, Krymchaks, Khazars, Karaites, BulgΔrs, Kipchaks, Pechenegs, Slavs, Armenians, Tatars, Italians, and Turks. Each of these nations was frequently characterised by their own more or less strongly defined religious specificity.
Did any of these groups use the Sri Yantra or something like it? I'm not an archeologist and I'm not familiar with these cultures but I'm just not finding anything so far to indicate that they did.
EDIT: I agree with the comment above from @Spencer that a closer look at the photo suggests that this Sri Yantra is just a recent act vandalism. It is drawn over what looks like an electrical conduit, circled here in red: