This incident is a reason for deep concern here in Poland.
Every such manoeuvre can end up deadly.
The best example is the recent accident in Germany.
In this case the business jet simulating passenger airliner
had just two pilots on board. Both of them died,
the fighter jet landed safely.
On 23 June 2014, a mid-air collision occurred over Olsberg, North Rhine-Westphalia, Germany, during an exercise simulating the interception of a civilian airliner that was out of radio contact. One of the aircraft consequently crashed; both occupants died. The other aircraft landed safely.
2014 Olsberg mid-air collision - Wikipedia, the free encyclopedia