There is also (sometimes) the problem of internal migration. In Russia it is people from poor Caucasus going north (in to Moscow). This is the issue (I think, I could be wrong) that is new to the core EU members, as previously they were not open to such things (Germans were one of the first countries to experience this with the fall of the Wall, but then eastern Germans were not as different to their western kind as immigrants from Balkan Muslim areas would be).
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Grumpy as always.
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