Do yourself a favor and listen to at least one of the six part series that Behind The Bastards podcast[0] did on Kissinger. It will give you a background, with sources, on the "controversial" statesman that you'll read eulogies about over the next few days.
[0] https://omny.fm/shows/behind-the-bastards/part-one-kissinger
[1] https://omny.fm/shows/behind-the-bastards/part-two-kissinger
[2] https://omny.fm/shows/behind-the-bastards/part-three-kissing...
[3] https://omny.fm/shows/behind-the-bastards/part-four-kissinge...
[4] https://omny.fm/shows/behind-the-bastards/part-five-kissinge...
[5] https://omny.fm/shows/behind-the-bastards/part-six-kissinger