This is the third day in a row with insane losses for Russia, today it passes 1000 personnel!
I'm guessing it's still the Russian attempt at a push on the eastern front. Except this is even worse for the Russians, than when Wagner pushed against Bakhmut.
It's absolutely enormous, but fortunately Ukraine doesn't have to deal with all of them, as some are in other regions protecting Russian borders, and there are also forces in Moscow.
But even with that many active in the military, losses of this magnitude are not sustainable. And Russia has already burned through most of their elite forces.
AFAIK it's usually only half in active service that are actually soldiers, the other half serve as support, for instance logistics medics and engineers.