You better make sure your plan won't backfire and won't lead to a large number of those highly educated youths staying in the US afterwards and contributing to the US economy.
And that's after you, as an adversarial nation, had already spent tons of resources on growing and educating those kids to the quality level high enough to be accepted into those top US colleges, as well as (presumably) paid for the tuition (which for international students can easily become x4 of in-state tuition and x2 of out-of-state).
Heavily investing into a highly efficient brain-drain program might not be as smart of an idea as you believe it is, if you are funding the side of it that drains those brains away from you.