Ukraine

These are the offical figures by the Ukrainian military. They obviously do want to make Russian losses look bigger then their own and have not reason to tell anybody what their real losses. Russia also publishes numbers, but unlike Ukraines they are not a bit too high, but insane.

The best resource for that type of info is Oryx's visually confirmed list. They have one for both Russian losses and Ukrainian losses. Every link is to a picture or video of the loss; click a few. Then just scroll and scroll and scroll.

There's a saying that when war breaks out, the first victim is the truth.
That said the Ukrainian numbers about Russian losses seem pretty accurate, when compared to numbers from for instance Pentagon or UK defense.
The Russians however have been shown to basically always lie and mislead. So even if Russia did release similar numbers for Ukrainian losses, they would probably be pretty worthless.