Both the Swedish military and the Danish military are well equipped to detect those planes with primary radars.
One of our main task while scrambling QRA jets towards such "visiters", is to fly up along side of the plane in question and thereby make it visable to the civilian ATC agencies. This basicly works by the fact that we fly the QRA jets with their transponders on, in close proximity to "visiters". Both the Swedish and Danish QRA does that.
Only problem is that we have limited playtime, and since the IL-20 Coot A can hang around for hours, we need to leave him at some point, since we need to go home and refuel.
In both this incident and the one that happend earlyer this year, the Coot A was followed by either Swedish Gripens or Danish F-16 (or both) prior to the incident. Unfortunately it was left alone at some point due to the fighters need for more fuel, and that was when the incidents happend.
It is my impression that the latest incident was not as close a call as the earlyer event.
And then again, there is more airspace around the other aircraft
