https://techcrunch.com/2019/09/18/russia-sorm-nokia-surveillance/

In cities across Russia, large boxes in locked rooms are directly connected to the networks of some of the country’s largest phone and internet companies.

These unsuspecting boxes, some the size of a washing machine, house equipment that gives the Russian security services access to the calls and messages of millions of citizens. This government surveillance system remains largely shrouded in secrecy, even though phone and web companies operating in Russia are forced by law to install these large devices on their networks.