This is a Steppe Eagle hatched in 2023 in the Tuva Republic. That year all Southern Siberia suffered from very cold spring and beginning of summer and thus lack of prey as a result. Many other eaglets and other raptors' nestlings died from starvation. But this tiny one managed to survive.
I tried to ring him, but his leg was too small. And 4 days later it didn't gow even a bit. So I left him ringless.