The next two books explore the Dark Forest Theory and the Fermi Paradox, and how humanity, including the Western powers, try to deal with this realization and t

The next two books explore the Dark Forest Theory and the Fermi Paradox, and how humanity, including the Western powers, try to deal with this realization and the pending Trisolarian invasion. The third book goes way into the future beyond the Earth, and even has a chapter from a different alien POV. Read like legitimate science fiction to me with a different cultural context.