You can read the article [open access] on the Nature website
Now, for the first time in more than 50 years, the two pre-eminent nuclear powers are operating without the guardrails that have provided control, stability, predictability and transparency to the global order. This increases the risk of a resurgent nuclear-arms race and global proliferation. Equally concerning is the absence of public discussions about the risks posed by nuclear weapons. The public, scientists and political leaders have remained mostly silent.