The relative size of the populations matter. France, Germany, and Russia have substantially higher populations than Ukraine. On a per capita basis, Ukraine has suffered egregious casualty rates. Keep in mind also that half of the Ukrainian population fled the war and now lives abroad. It is unlikely they'll return, especially the men, who'd be drafted and sent to die the second they showed up at the border. Also of note is that there's a big difference in the birth rates. Europeans used to have much larger families and much more young men relative to old people in their populations. Now, they're not making enough babies to maintain their current populations, and Ukraine has some of the worst birth rates in Europe.

You're comparing raw numbers outside of some really important context. Yes, the world wars were absolutely devastating, particularly for Germany and Russia, but Ukraine's getting absolutely mauled right now in ways that it'll feel for generations to come. They have no intention of changing course either, which makes it all the worse. Just for context, when Russia saw casualty rates like this in 1917, they had a little revolution.