The Lear I think was out of Austria had pressurisation Failure and didn't a Famous Golf player end up going the same way. Seem to remember reading that this model you had to turn the Oxy on pre flight and you couldn't get at the bottle once airborne.
The Mig was a 23 that the pilot had to eject from because it wasn't producing full power. Course as soon as Pilot and Bang seat left the airframe less power needed to maintain flight, so off it went.
Remember the Wildenrath battle flight and UK Q jets on stand by to intercept or getting A/B but the 23 as rightly pointed out ran out of gas in Belgium.
There was also a Harrier GR3 (Ejected from) that went the other way from Gutersloh and the Lightning Battle Flight was launched to go shoot it down but again it wemt down before being shot down.