The status of Russia’s signals intelligence satellites
In early February, Russia launched the latest in a series of signals intelligence satellites that are part of a project called Liana. Initiated shortly after the disintegration of the Soviet Union, the project has suffered significant technical problems and delays over the years and has so far failed to live up to expectations. A new generation of signals intelligence satellites is currently under development, but may take at least several more years to become fully operational.
https://www.thespacereview.com/article/4154/1