Statistics about the body exchange between Russia and Ukraine since the start of the war to today. At first, it was even, and in some periods, the Ukrainians had a lower body count and the Russians more. This went on until the beginning of 2024 and from there the Ukrainian body count began to shoot up.
Of course, this can also be due to the Russians advancing and having more opportunities to pickup enemy bodies and recover their own. But we don't see the same lop sided ratio when the Ukrainians were advancing, such as the Fall 2022 offensive in Izyium, and the Summer Counteroffensive of 2023. The numbers were also fairly even during the Russian Popyansk flower break out, and also during the Russian offensive in Soledar and Bakhmut in the winter and spring of 2023. During the Ukrainian offensive in Kursk, there should have been more opportunities during the Ukrainian advance to collect more Russian bodies, but the ratio keeps going even higher against the Ukrainians.
To add, even if the Russians are advancing, there are still frequent and fierce Ukrainian counterattacks and pushes to attempt to regain initiative.
None of these would count or affect casualties in the rear due to deep strikes, which we would assume the Russians also conduct way more strikes than the Ukrainians.
As the blue bars are clustered around the same numbers, 501 to 503, then two 757s and three 909s, this seems like the Russians are limited to sending bodies back due to some constraint of acceptance on the Ukrainian side. This seems like an indication that the Russians still have a surplus of more bodies to send back in cold storage, waiting for the Ukrainians to send their go ahead.