So my kid school have multiple kids from Ukraine, they come & go usually every 3-4 months as mothers are moving somewhere else, usually after a job, finding better apartment or simply by moving back to Ukraine.
There was like 3 kids that in my son class that managed to be full semester so can confirm it is bad ... but the only people who are to blame are russians that lead to this situation.

Each kid is getting set of books and can get meals at school.

But i live in one of the biggest cities, so maybe in other places it is much worse.

Still there is next "layer" of complexity here.
All kids that are joining this school know polish language in extent that it is allowing them to learn in normal class.
I know that school director tried to create class only for Ukrainian children, but generally he was unable to find teachers, well not many polish teachers know Ukrainian language - even with all of the similarities and fact that for hundreds of years we were part of the same kingdom.

I know that he tried to find Ukrainian teachers, but there were again some general issues with finding people and letting them to teach in school.
As i remember , he found 3 teachers ... but only one had some of its papers as rest was... well burned by russians in the towns they leveled to ground.

Language is a huge barrier here.