How would they shoot down a jet without causing as mush damage as the terrorists crashing it into the ground.
I think it was intercepted over the sea, but thats only the most extreme of scenarios where a typhoon being in sight might be useful. It may be that comms aren’t working to ground level but do work over the 100m or so range to the fighter, and they can act as a relay. it may be that all the electronics on the aircraft are screwed and the fighters can provide a useful “escort” to help them navigate to safety. if may be that the plane has encountered some significant damage and nimble eyes can help the pilot understand how his handling might be affected. it may be someone is trying to hijack it, and the fear of getting shot down rather than taken where you want brings about a degree of cooperation.