I know someone married to a Ukraine woman, and has been for decades...so some marriages are out of love, and last. Others are for citizenship.
I think it best to let God find a person a spouse...everything we think we know about life isn’t enough for such a big investment of life. People deceive either intentionally or with promises that are never kept, infidelity, among other things. Also, we can be our own worst enemies when it comes to life decisions.
I’m not criticizing any relationships made by those from other countries, our military has found some great marriages by marrying abroad over the years. The mail order bride thing is a bit unstable in my overview.
I agree; I don’t think mail-order brides do well because there isn’t really freedom on the behalf of one of the “partners”.