In an apparent reference to the Indo-Pak tension after the Pulwama attack, Bolton wrote that the crisis was defused after hours of phone calls.
Forty Central Reserve Police Force (CRPF) personnel were killed on February 14 last year in a suicide bombing by Pakistan-based Jaish-e-Mohammed (JeM) in Jammu and Kashmir's Pulwama district.
"After hours of phone calls, the crisis passed, perhaps because, in substance, there never really had been one. But when two nuclear powers spin up their military capabilities, it is best not to ignore it. No one else cared at the time, but the point was clear to me: this was what happened when people didn't take nuclear proliferation from the likes of Iran and North Korea seriously," Bolton said in the book.