A civilian airliner came close to a Russian aircraft that was flying in the area to the south of Sweden without using a transponder.
SAS Scandinavian Airlines Flight 1755 took off from Copenhagen’s Kastrup Airport in Denmark on Friday December 12, 2014 at 11:12 hours local time. The flight was performed by Canadair CRJ-200, registration OY-RJK. Destination of the flight was Poznan, Poland.
An unidentified aircraft was observed on military radar, in the proximity of flight 1755.