Bod wrote

It was an exercise of course, to test the US defences.

https://www.youtube.com/watch?v=R9Q_B-yaJrU

Did many of you know about this?

I certainly hadn't but the claim is quite silly given
that anyone with ICBMs or submarine launched
nukes could have done it anytime, and still can.

In fact it would have been a hell of a lot more surprising
if no nuke bombers had got thru in that war game.