They (Russians) make their own RACAL/Watkins Johnson class sdrs for gov/commercial/spooks but for this setup they deploy Icoms. I wonder if it's due they desire to export the units with receivers they are comfortable with rather than exporting spook stuff they keep for themselves?
I doubt it's a cost factor bearing in mind that these things become a huge target in time of open hostilities, with the loss of a cheap radio rather than the cost of a spook rig along with the vehicles and men when the attack comes.