Video captured a group of Russian soldiers appealing directly to Putin for help in Ukraine.
This is evidence of the incompetence of our superiors and of the whole unit," a Russian soldier says in a video obtained and translated by CNN.
A separate video, also published by CNN and taken by another Russian soldier in eastern Ukraine, showed smoke coming from a Russian tank.
Up to 200,000 Russian soldiers have been wounded or killed, while an estimated 40,000 to 60,000 have died, according to UK officials.
The analysis estimates 60,000 to 70,000 Russian soldiers have died.