In my opinion, this just all comes down to how the US has a looser definition of whiteness nowadays that concentrates on skin colour + having features stereotyped as belonging to Europeans. We’ve got to remember whiteness is at the end of the day, a vehicle to confer privilege. Who is or is not white depends really on who the socio-political climate of the era is willing to extend this privilege to. As seen from ‘How the Irish Became White’. Whiteness or lack of is a tremendously fluid concept that fluctuates across time and space.
Further, we have to take into account how in the US (as many people here are Americans), ethnicity has become less important to determining privilege as compared to the rest of the world. If you have light skin and European-looking features = white. German or Polish-American probably is an insignificant difference in the US, but German vs Polish in the UK leads to very different treatment. Or consider Scarlett Johansson, for instance. I know many people read her as a white woman, but she is a Jewish woman whose family hails from Russia. If she had lived in Europe, ethnicity matters a lot still and antisemitism continues to racialise Jewish people as an ‘Other’. It is highly likely she would not be seen as a ‘white Russian woman’- antisemitism still exists in the US of course, but like in Europe the idea of ‘white’ definitely does consider ethnicity not just appearance. The same goes with Kim Kardashian- I mean geographically, Armenia can be classified as a country in Eurasia. (The line where Europe ends and Asia begins is honestly arbitrary and is very much political). The extent her ethnicity matters to determining privilege and therefore whether she is seen as ‘white’ is simply different in the US, compared to Europe + Eurasia. As we know, Armenians suffered a genocide at the hands of the Ottoman Empire.
The entire structure of privilege and racialisation in Europe + Eurasia I would argue, has a very strong ethnic dimension. People see ethnicity even within what the US may consider just ‘white’. I’d also argue that systems of racism elsewhere may concentrate more on ethnicity, and in the case of the Ottoman Empire, it wasn’t a white privilege thing at all, as much as being Turkish- the majority ethnic group in the country. So if people see her differently, it’s really about the context they see her from.