The Swedish public service reported this morning that a SAS flight SK681 on route Copenhagen to Rome on March 3rd 2014 came to within 90m of an unidentified target, which was later confirmed to be a Russian IL20M. The news piece
here, so far in Swedish.
According to the story, the IL got picked on the Kastrup PSR and info was forwarded to the bewildered crew. The crew manoeuvred to avoid and reported seeing the IL in great detail, passing left to right. The incident happened in international airspace and naturally the IL was flying with its transponder off and could not be seen on the SSR or on the TCAS.
Scary stuff. 90m up there is nothing, this could have been ugly very easily. I expect some questions to be raised soon, notably why the Il was not escorted and an early warning given to Copenhagen ATC.
EDIT to clarify: According to the news piece the incident occurred 50 km south of Malmö above international waters and the SAS flight was infringed shortly after takeoff.