>>64234083
Ukraine doesn't have nearly as much issues with tank crews as Russia does. While they do have some western tanks, most of their tanks are still the same soviet stuff as Russia has. The difference comes from the fact that Russia tries to attack, while Ukies are focusing on defense. That means their tanks are less out in the open and more in dug-out locations, only turrets sticking up from hard cover. This limits the damage that they take, making it much safer for the crews.

Ukies also have much better information, drone coverage network and NATO feeding them up-to-date knowledge about enemy tank movements. So they generally have a better idea of what they are doing and what to expect.
Another thing is the home field advantage to any crew/medevac operations: If the tank (for whatever reasons) becomes inpoerative, they are close to their home lines and usually have a pick-up and medical attention available and ready, if needed. So crew survivability has been much better throughout the war.

I don't think they are suffering from crew losses nearly as badly, and their tank crews in general are better trained than russian ones.