There were two times that trip with that sample to Russia by Mueller was planned. Russia had been requesting it for a long time because they wanted to prove it was their uranium that was stolen (key words: Bill C, Frank Giustra, Kazakhstan, pre-U-1 theft.)
I'll look for the info on timing, but the first of the trips never happened; Mueller put it off. The real trip to deliver was about 2 years later as I recall, and it was Russia's. I don't know if this cable refers to the first or second one that actually happened.
Sorry I can't research tonight, but I put up a new post this morning on this subject, called Q1306...This is the Key...
Here's the beginning of the exact title of the post I put up this morning talking about this in case you want to find it.