Terrorism is a threat to us all, crazies like in ISIS and in many other places, Pakistan, etc. wouldn't think twice about using a nuclear weapon if they had it.
Strange bedfellows as they say.
We teamed up with Josef Stalin against Hitler. Sometimes deals and compromises must be made but this was a no-brainer, sure we should tell them and likewise, they should tell us if they were to discover something.
All of this talk has been about this.
What I'm curious about is how we got this information and they didn't know over there. Of course, that's probably top secret or confidential.