If I was based in a country I would not want to target those that can more easily get me into jail and/or kill me.
I have no idea if FSB work for them, this is more speculation than open secret, but they certainly do tolerate them and see them in a good eye as long as they target western companies and agencies. The enemy of my enemies is my friend.
Let's say some three digit agencies create sort of malware distribution forums in the darknet. They make sure to only broadcast to people who wants to play with malwares so the net catches the "bad guys" mostly, except for a few curious researchers or journalists maybe. Then they start to share recent generarion malwares they created. They don't need to distribute them by themselves because they already have the CCC servers. Some malware gangs would eventually be the frontend and start the distribution.
In this way you not only distribute the malwares without getting impacted, you also get to know the gangs so whenever you want to catch a few fishes you just pull the net.
Once the darknet forum dies out or they need to wipe the records, they would just leave and create a new one.
Just my wild thought.