There is a big, fundamental problem with this story.
The headline writer used the word dismissed, yet nothing Russia actually said could reasonably be interpreted as them “dismissing” that terrorism was possible or coming.
Why would they write a title that says “book reveals” instead of “book claims”?
A book can write anything, it may or may not be true. A news article should say a book “claims” something unless it has some reason to believe it absolutely.
A lot of books are written based on hearsay from one side...