I didn't know that. I'm not a native English speaker. If this is actually an established way to informally address Kazakhstan citizens in English, then it's OK,

I didn't know that. I'm not a native English speaker. If this is actually an established way to informally address Kazakhstan citizens in English, then it's OK, I do not object. But I'm still skeptical about it. I think in my own speech I'll stick to "Kazakhstanian" (despite the word "Kazakh" is so much easier to type). Because I'm just used to make distinction between words "Kazakh" and "Kazakhstanian" when I speak Kazakh and Russian languages (most popular ones in Kazakhstan).