For Ukraine, war deaths would likely be a footnote compared to emigration when a new census is eventually completed (I don't mean to sound cavalier, but am trying to put things into perspective). An estimated 20% of their population has left since the start of the full scale invasion - ~10 million people - by now they've settled into new lives abroad (my 8 year old daughter's class here in Canada has 3 kids from Ukraine alone).

Ukraine is going to have some painful demographic issues to deal with when the dust settles (and I am cheering for them!).