>I once heard unsourced speculation that the French might have given the British the scoop on how to sabotage incoming missiles.

reminded by association - in the new Russian&Serbian movie https://en.wikipedia.org/wiki/The_Balkan_Line released for the 20th anniversary of the war there is a scene with the French bomb dropped on a house in Serbia and which didn't explode because it was intentionally sabotaged. Doesn’t seem to have propaganda value, and I’m wondering whether it is a play on real facts or just an artistic reference to the French resistance to the NATO bombing of civilian targets.