Yeah but for how long? The troops the Ruzzians are flooding into Kursk right now simply aren’t up to the job. They “may” be able to stop the Ukrainians at their newly prepared defences but that’s not a given. Putler can not allow the Ukrainians to stay in Kursk and, realistically, the only way he had of forcibly dislodging them will be to redeploy troops from the Donbas.
That’s in Ruzzian Rubles, in the civilized world we refer to that as: two flat stones.