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Isn't this basically the premise to the "3 Body Problem"
The San-Ti were more honest about it.
Well, sort of, they asked for help with their problem, then hamstrung Earth's progress by deceit so that they could make it over in time.
I do not remember there being such a gap between book and show but at least in the book it's earth reaching out while the one good guy on Trisolaris tells them not to.
That does sound familiar; I think I read it eight years ago so my memory is very patchy (to the extent I used the show to cover what I thought happened!).
In which reguard?
The Trisolarians actively blocked humanities scientific progress in order to avoid further advancement during the 400 years it would take their fleet to get to Sol. Humanity didn't choose to slow down or even regress.