Exactly this.Simple conclusion is, land can be taken back, lives cannot. If all the fights in Ukraine the USA and Europe sends their soldiers in as mercenaries, ok simply kill them too and they will lose soldiers and equipment to meaning that Ukraine and the EU and to some small level the USA will lose troops and weapons as well so in the long run, Russia is only going to be gaining with a Ukraine no longer capable of fighting and an EU and USA with depleted man power and resources. And those that are lost will not be coming back any time soon, particular when the EU and USA doesn’t quite have the resources to produce the required soldiers and weapons in bulk that they need to beat Russia without escalating into nuclear war
Some may point to the counterexample of Vietnam, where North Vietnam took disproportionate casualties yet still conventionally defeated the US and puppet regime.
But that conflict had many differences:
1. It was not a total war between US and North Vietnam, and US self limited itself (due to fear of escalation with China and broader strategic consideration of NATO vs Warsaw Pact global balance of forces) from invading North Vietnam. It is a total war between Russia and Ukraine.
2. Vietnam had typical developing country demographics with a fertility rate of 5.7 children per woman and a median age of 20 even in 1991, which is on par with African countries. Ukraine has demographics worse than Japan with a fertility rate of 1.4 and median age of 41.
3. Ukraine is in a much more hostile climate where more substantial infrastructure is required for supporting life than Vietnam, where people can sleep in the open year round and multiple crops of rice can be grown and harvested by hand.
So you cannot compare the capability of Vietnam to absorb casualties and Ukraine. Vietnam had a much younger population, much more fertile population, living in a much less hostile environment.
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