Why would you want to keep it deniable? What's the point in this sort of sabotage if nobody knows you did it?
Because otherwise it would be an act of war. At which point they might as well have just fired a rocket into the country.
This isn’t a show of power. Sabotage works best when your target doesn’t even realize it was sabotage. Similarly it’s best if you misattribute blame because then you’re fighting the wrong party and looking for ghosts.
Russia throwing journalists out of windows or paining with Novachok - that’s a “it’s us, you can’t do anything about it, don’t fuck with us” power signal that benefits from “plausible” deniability - you can’t prove it was us.
Russia is trying to avoid retaliation through stricter sanctions, for example.
It's not about demonstrating, it's about results and this is only training.
Doubt is always good.
They seem to be very good at "mob tactics."
No one can prove anything, for example, but anyone knows that people that piss Putin off, need to stay away from windows in high places.
If the main point is slowing/frustrating drone production?
It would honestly be kind of fair game to sabotage production of drones that would be used against you, even if they're made in a country you're not at war with --- if it wasn't for Russia having a lot of responsibility for that war in the first place (to put it mildly).
The ideal scenario is everyone suspects it's you but can't prove it.
You have both the desired threat, but no concrete biases for an official response.
Also an uncertainty limits action - it might be a random event, it could even be a false flag.
One of the problem's here is narratives are being spun by multiple actors and it depends on who you believe.