I heard KAL917 on 121.5 as I was getting airborne out of London. It sounded like the Captain had already started the descent shortly after, as he was reporting the level passing and waypoint passed.
I had an idea to SELCAL him on 121.5, but ECAM lit up and of course, our priority was our flight. After we solved our aircraft's problems I SATCOM'd Zurich to get their SELCAL code off the filed flight plan. Too late, fighters were apparently leading him into Stuttgart.
On another point, if you are intercepted ICAO rules state that the intercepted is to follow the interceptor even if it contradicts ATC clearances.
Additionally, the phrase "TRANSMITTING BLIND" should have been used in 917's transmissions if they were unable to hear other stations.
I wonder if KAL917 tried SATCOM, HF or even an ACARs back to KAL?