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.
Antonov was made in Ukraine too. The biggest cargo airplane ever built was the Antonov 225. That plane was absolutely insane, and could carry diesel locomotives and whatnot.
https://en.wikipedia.org/wiki/Antonov_An-225_Mriya