What does "to foster one at the expense of the other" mean

Question

Although operational and strategic intelligence analysis have different aims, they are mutually dependent and cannot be carried out in isolation. Attempts to separate them, or to foster one at the expense of the other, will result in a fundamentally fl  awed intelligence programme and a failure to generate meaningful assessments of criminal activity.

Answer 1

پرورش یا تقویت یکی به قیمت فدا کرذن دیگری

Answer 2

رشد یکی به هزینه دیگری