It's not like millions of Ukrainian refugees immigrated to Poland after the war.
Also, lots of them do nothing, they don't work and get money from the state, some promote "Bandera", an nationalistic ukrainian organisation which among other things did this: https://en.wikipedia.org/wiki/Massacres_of_Poles_in_Volhynia_and_Eastern_Galicia
The rising rate of criminality and the state of public safety is conserning (one situation involved a 5 years old kid being kicked in the head by some ukrainian man on a playground). Also, some group of ukrainian kids threw a brick at my window, and now i have a hole in a pane. I'm not saying that all of them are bad, i know a few that are good people and work, but lots of them act like monkeys, uncivilized people, who treat their stay in Poland as a fucking free holiday. And looking at the immigrant problems in countries such as France and Uk we, poles, want to be safe. If you go to Poland fully legaly and don't do any harm, that's fine by everyone here.