Interesting.
So, I think your question can be changed to
"If the Ukrainians were black African/Asian Muslims would we have welcomed them into the country in such numbers"?
The answer is almost certainly "No".
We could also change the question to
"If the Ukrainians were black Christians would we have welcomed them into the country in such numbers"?
Again, probably "No"
Or "If the Ukrainians were white Muslims would we have welcomed them into the country in such numbers"?
Again, probably "No".
So the only way that the Ukrainians get into this country in such numbers is if they are seen to be exactly the same as us! Predominately white Christian in looks, attitudes, morals and culture. I do not think that is racism, it just seems to be human nature, people tend to form groups with like minded people. That seems to be exactly the same whether you are white, black, brown, Christian, Muslim, Jew.