I don't think it's a problem of group or national achievement as a group. We do very well, and so do undiverse Russians and undiverse Chinese students (and yes, both countries have underrepresented minorities) The problem we want to solve is spreading success across the members of society who could take advantage of the opportunity. Just different priorities.

One interesting observation, for which I don't have any citation, is that I find there is less trepidation to enter CS and Engineering careers from women who curiously come from Russia and China, which at least historically have been quite patriarchal. In some ways it might be that constant drumbeat to succeed and emphasis on science over softer subjects could have an impact, but it's all speculation on my part.