My take on this is that in the US, Europe, Australia, Canada, UK and most western countries , the caucasoid men desire East Asian (read, Mongoloid) women . In the US alone, there is an increasing number of Asian women with men of other races and Chinese, Vietnamese, Korean and Filipina women rank high on the 'ideal Asian woman' chart.
So the point is, the Mongol race might be wiping out the caucasoids in Central Asia, but in the west , Mongoloid women are being mated with.
Genocide and Intermarriage is two different things. Mongols genocide, rape, forced slaves women to married them. It wasn't just Caucasoid women there was also Mongoloid/Caucasoid women
Here is the U.S interracial marriage census
Asian/White marriage
36764 Chinese American men married white women.
112665 Chinese american women married white men
28388 Japanese American men married white women
80788 Japanese American women married white men
34823 Filipino American men married white women
164160 Filipino American women married white men
14066 Korean American men married white women
85766 Korean American women married white men
8391 Vietnamese American men married to white women
30418 Vietnamese American women married to white men
Asian/Hispanic marriages
4949 Chinese men / Latino Hispanic women
6993 Chinese women / Latino Hispanic women
4983 Japanese men / Latino Hispanic women
6784 Japanese women / Latino Hispanic women
12320 Filpino men / Latino Hispanic women
22496 Filpino women / Latino Hispanic women
2259 Korean men / Latino Hispanic women
4563 Korean women / Latino Hispanic women
1498 Vietnamese men / Latino Hispanic women
2912 Vietnamese women / Latino Hispanic women