One hopes that Ambassador Bolton is taking notes. Should he become SecState, there is a lot of cleaning he will be doing.
Another option is a stranded time traveler who wants to be rescued, but not contaminate the timeline. So he does something which would be meaningless to a contemporary, but which would jump out at someone from the future. In one such classic story, the protagonist is stranded in the 1930s. He runs an ad in a newspaper with a mushroom cloud, and the caption "All the Talk of Our Market," ATOM. In the future, they know approximately when he is, check the records, and find this anomaly.
Even Churchill, who had definitely seen the elephant, came up with some goofy ideas. Not to compare Willy with Winnie!
As a retired military and commercial pilot, I will point out that the tendency to blame a crash on "pilot error" before the wreckage has cooled is not limited to the Russians. ;)
These are very old numbers, ca 1975, and for military aviation. At that time, if even one crew member survived to testify, even a non-pilot such as a flight engineer or loadmaster, the likelihood of finding crew error as the primary cause was half of what it was if all aboard were killed. With the greater use of black boxes on military aircraft, the ratio is lower today, but there is still an discrepancy.