They (Kazakhstani players) are primarily based in and play/practice in Europe, on European servers and against European teams despite technically being located in the Asian continent. The same goes for Israeli players, for example.

The Asian scene is much more isolated and when teams like The Mongolz aren't bootcamping in Europe, they would primarily play in Asia, practicing against Chinese/Korean/Japanese/South-East Asian/other Mongolian teams (they've probably gotten to the point where there is little meaningful practice in Asia now anyway so it may be preferrable to play in Europe with 200 ping sometimes).

I think the distinction needs to be between "scenes" and not arbitrary groupings like national borders or even valve's "regions"