Another reason why they might disagree is
Ukrainians get helicopter money in some of EU countries, e.g. Germany. A mate who is married to an ukranian girl (who came long time ago to study to germany) has told me about a common social payment scam that lots of ukranians do :
Germany provides free social benefits to ukranians, i.e. they pay their rents
An ukrainian rents an apartment. Usually job center pays rent directly to the landlord, but a tenant can ask job center to pay rent to him instead so he pays the landlord. So they do that and after few months stop paying the landlord.
Guess what, german laws are such that the landlord is unable to evict a refugee ukranian
The reason he told me that, is that his Ukrainian wife wants to rent out their apartment in germany and they refuse to rent it to ukranians.