I don't think I agree with everything you've said, but the point of American men looking elsewhere for brides isn't a new story.
Back in the early days of my Navy career, it was pretty common for men to actively seek and court Oriental/Island women, affectionately (and probably bigot-like) referred to as "rice-burners." Many men found the concept of marrying a "corn-eater" unfathonable.
In general, their attitutudes toward American women could be summed up as "not worth putting up with." That was well over 20 years ago. So the Russian bride syndrome isn't anything new.