Is there anything to be got that can not be collected anywhere else, specifically in Russia?
GSM, 3G, 4G, 5G interceptors, cellular tapping and eavesdropping
Stingrays, also known as "cell site simulators" or "IMSI catchers,"
are invasive cell phone surveillance devices that mimic cell phone towers,
and send out signals to trick cell phones in the area into transmitting their locations and identifying information.
cell site simulators : <https://en.wikipedia.org/wiki/Special:Search?search=cell+sit...>
WiFi snooping bases, etc.
Re comment "...has once again become the espionage capital of Europe after Russia’s invasion of Ukraine — and Austria’s government seems in no rush to change that."
It's obvious why not, to do so would instantly tread on the toes of these organizations and that's just not going to happen.
But all the known Russian spies were not sent home, so the West is angry.
And then you have buildings like IZD Tower which are known to be almost certainly NSA spying sites.