Huh?
When the 1973 Paris Airshow came around, the Communists of course had to show off their latest theft, er, "achievement". So they sent a Tu-144 to do a demonstration. The French, though, wanted a closer look at the one major change to their design done by the Soviets - those canards. So they assigned a Mirage jet the job of getting good photographs of the canards in action.
During the demonstration flight, the fighter jet got too close. The Concordski pilot had to take an emergency evasive action to avoid hitting it - and indeed, no collision occurred. However, all 4 engines stalled. To restart them, the pilot put the plane into a dive - apparently the jet engines had some kind of airstart propeller system installed.
Apparently, this worked as well - great piloting at work. The only problem was that by the time he got a restart, he was too low - after all, this was a flight to demonstrate the plane to people on the ground. When rapidly pulling out of the steep dive, the plane broke up, killing all aboard, as well as people in a village next to the airport.
At the time of the crash none of this was known - everyone thought it was just a case that the Concordeski was crap. The full story only came out years later. It was another case of French perfidy in action - even if it was to the detriment of Soviet a-holes.