It's a book title authored by Herman Kahn that was required reading for incoming freshmen at come colleges about 50+ years ago which depicted the possible stages leading to nuclear warfare . This article looks at the likelihood of Putin using low level nukes and what the US response might or should be.
What If Russia Uses Nuclear Weapons in Ukraine?
A look at the grim scenarios—and the U.S. playbook for each
www.theatlantic.com