I would guess this was a reference to the Wagner incident.

Wagner, now located in Belarus, was still Russian when they downed 6 helicopters and a plane last week-end.

I think they're the worst single day losses in the Russian Air Force's history (which only goes back to the 90s, but still).

Tell me, define "Russia attacks Russia", what does that mean?

What do you gain from spreading misinformation?

EDIT: ok downvoted again, let me rephrase

When the goal is to throw away the government, what do you gain from demonizing "Russians"; how do you think these people will react when Putin will be gone?

"Putin's mercenaries rebel against his failing leadership", there, your homework free of charge, +10 to intellect