Yes, it seems to me that Japan, and other East Asian (and also South East Asian) countries put a high importance on keeping their ethnic and cultural homogeneit

Yes, it seems to me that Japan, and other East Asian (and also South East Asian) countries put a high importance on keeping their ethnic and cultural homogeneity. My experience, as mentioned in other comments, is that they tend to be horrified when they see the consequences of large non-European immigration in Europe, so I doubt that they will adopt similar policies anytime soon.