I seem to remember many years ago hearing that, when the Tornado was being designed, the German partners considered it politically unacceptable for a Tornado to reach the Russian border at low level from bases in West Germany (don't forget there was a West and East Germany in those days). Targets in East Germany and Poland fine, but no further. I believe that when the Tornado replaced the Buccaneer in RAFG that some of the Bucc's targets had to be handed over to F-111's, as the Tornado didn't have the range to cover them.
Could be an urban myth I suppose...