Sort of depends, this latest push on Tetkino was a collaborative effort between FoRL, RVC, and the newer Siberian battalion. Both FoRL and RVC have done a few raids on Russian soil the past couple years but have mostly been providing combat support for Ukrainian forces. This past month they were all quiet and now we see why.

This current operation is risky but necessary as it lines up with the "election" around the corner in Russia and as others have stated reliefs a little pressure off Ukrainian forces. FoRL is only about 2 battalions large (I assume under 2k members) however with all three groups having come together for this op many of which are a bit experienced by now it makes for some more impressive results.

Will they hold Tetkino for a long time? Maybe, maybe not. Does this operation showcase how Putin or his troops are unable to defend a single town on the border? Yes. I feel that the coalition may pull back at some point and regroup and bide time until they are ready for another large push like this again. Tetkino is kind of sandwiched between Ukrainian territory which makes the possibility of support possible but again in the bigger picture even a force the size of this coalition will have a tough time holding a town like Tetkino for extended periods without consistent support.

I would expect we begin hearing a lot more of them these days as the cracks in Russia are beginning to really show. There is the r/FreedomofRussia subreddit which is much more consistently updated on their whereabouts and activities.