This is the Polivoks by Vladimir Kuzmin, probably the most well-known Soviet synth. Here's a brief demo from its inventor:

https://www.youtube.com/watch?v=fVNN2SO88UI

Even 40 years after its conception, it still slaps. I could easily imagine that being put to good use in a modern techno or electropunk setup.

Here's a more in-depth review by ambient producer and instrument collector Hainbach going over the features:

https://www.youtube.com/watch?v=s8BHnQAXdr4

I absolutely love how this thing sounds. Not that i'm gonna get one in the immediate future, there's just so much other stuff i need to set up first and the lack of MIDI or CV outputs makes it a bit difficult to work with in a modern electronic studio*, but damn. This vid shows how well it holds up to a Minimoog - basically the gold standard for vintage analog lead synths that everybody going for an "east coast" sound wants to copy, and the Polivoks easily matches its depth and sonority in a side-by-side comparison:

https://www.youtube.com/watch?v=YbdyMP_CiIY

*Yes, i know that Erica Synths from Latvia is producing a modular version that has a ton of patch points, but all the added features, while being super useful for connecting it to other instruments, also mean it's a good deal more expensive than the used ones. I'm also not fully sold on that one yet as far as sound goes. There's a reason electric engineering components from the USSR are still so sought-after in making musical instruments, they were just really, really good. If you play guitar, you may be familiar with how highly prized soviet tube tech is - that's because the older MiG's onboard electronics were entirely tube-based, so the tube manufacturers there built to military specs and produced exceptional quality, and that goes for a lot of other components like diodes and stuff as well. They placed quality and reliability over simple economic concerns, and it led to some amazing results.