In Japan and South Korea there is deepening concern over the reliability of long-time American security guarantees – whether the U.S. will come to their aid in the event of a war. This has been turbo-charged by Donald Trump’s tough treatment of traditional U.S. allies, which has some in Tokyo and Seoul calling for a reassessment of their non-nuclear policies.
Japan actually has the technology and know-how to rapidly spin up a nuclear weapons program because they were already doing it before signing up on their non-nuclear policies with the US.
The real question is which country is going to be the first to actually jump ship. I’m fairly certain like 95% of the UN is just going to wait out Trump’s term and hope the next president will undo all his insane plans, because no one wants to lose longstanding ties with the US, even as the rug pull of 70+ years of American influence going under gets closer to reality.