Crucially, it's not just the world in Asia that has changed. Many posters use the phrase "the West" when "the West" is no longer the unified force it was. The unstable, unpredictable, and perhaps unwitting, Trumpian USA has weakened (greatly weakened, I would argue) and fractured the unified "West" that kept threats (perceived and real) at bay for 70 odd years.
I suggest we are in a more unstable world now than at any time since October 1962.
grizz