Here, I won't add anything, I'll just cited what I've brought up:

The Neanderthal stuff is recent research and still kind of in flux, so you could object that there might be another interpretation somehow. The bit about everyone outside of Africa having admixture is here, and it actually mentions that east Asians have the highest proportion.

On the origin of white people, here's the steppe herder component and here's the bit about them having horses. This is the Middle Eastern agriculturalist part and these are the original hunter-gatherer inhabitants of western Europe, specifically the section on them likely being black and blue-eyed.

This is a photo of historical Ainu in Japan which gives a sense of why I'd compare them in appearance to Europeans, as some of the Europeans themselves did. There isn't actually a close relation: