RWA had some interesting perspective on this recently that goes a bit against the narrative of “Ukraine is pulling people off the streets, because there’s nobody left”. Essentially what they said was that Ukraine is such a poorly centralized and governed state with a weak bureaucracy nobody knows how many people live in the country and where, the war and refugee situation only exaggerated this. Estimates of Ukrainian population before the war ranged between 30 and 40 mio, because afaik they haven’t been able to administer a census this century.

So the problem according to that isn’t so much that there’s nobody left physically, but that they’re struggling heavily to reach the people that are or should be there, if they even know these people exist. Hence the pulling people off the streets - they just can’t reach them any other way.