"way bigger" should be around 4 times bigger to allow parity in a war of attrition IIRC
Closer to 5x, considering that official numbers of Ukraine's population included Donbass and Crimea.
So I suppose from a Russian perspective, 3 times bigger is not "way bigger", but "affordable".
There is no Russian perspective in simple math, way bigger in Russia means same as everywhere else.
Fact is, Ukrainian casualty numbers are currently classified, supposedly for a good reason.
Russia continue to have advantage in artillery, air, and as even Western sources admit, electronic warfare too.
Add to that the fact that Ukraine has been unsuccessfully trying to advance against Russian fortified positions for significant part of the year.
And they still lost about twice more territory than they gained.
We don't have objective data for casualties, aside of propaganda numbers from both sides. The facts above though suggest the picture is not too rosy for Ukraine right now.
Russia army has recruited 335,000 people this year. They mobilized 300,000 during last year mobilization. They currently have 200,000 soldiers in Ukraine. Let's do some maths...
Let's do it.
- How many of those 335k are in Ukraine? Training takes months. How many are even suppose to be there? I hope you are not suggesting all or even most Russian troops are in Ukraine now.
- Before September 2022, Russian contracted soldiers had option to terminate their contracts and quit the job. How many did it? One of major purposes of last year's mobilization was to compensate for these so-called "500-s" cases and to prevent further quits.
- How many people Ukraine mobilized in almost 2 years of non-stop mobilization?
I don't think your math will signify a lot unless you can answer these and many other questions.