>The country’s analysts were reportedly also able to track the location of the hackers' offices down to a university building next Moscow’s Red Square.

When I lived in Moscow my location was often misidentified as next to Red Square on various sites that tried to guess my location by IP or whatever else they use. I hope the analysts didn't use same tools.

I would assume at the point they had CCTV camera feeds they would be able to confirm the precise building by having agents watch people go in/out and comparing clothes of people on the camera vs in real life. But who knows what actually happened.