How common is this?
Their is a large asian population in NZ, I've heard similar about the US and AUS
But never anything about asians in europe
There's a huge population of Asians in Europe, just more western/central Asian population (closer to Europe) rather than South East Asians (closer to Oceania or Americas)
If you're looking specifically only for South/East Asian population (CH, JP, KR, SG, etc) , this is more common in Western Europe and British Isles, but not so common once you go more inland into continental Europe
Historically, world super powers had separated spheres of influence around the globe, and this can be somewhat noticed in the migration patterns as well (important to note: colonialism and/or corporate colonialism also had a huge role in this type of migration)