For the past 75 years, America’s nuclear umbrella has been the keystone that has kept East Asia’s great‑power rivalries from turning atomic.
President Donald Trump’s second‑term “strategic reset” now threatens to crack that arch.
By pressuring allies to shoulder more of the defence burden, hinting that US forces might walk if the cheques do not clear and flirting with a return to nuclear testing, Washington is signalling that its once‑ironclad nuclear guarantee is, at best, negotiable.
