gambit
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When I was on the F-111E -- RAF Upper Heyford -- at every arms limitation talk, the Soviets always demanded the F-111s from RAFs Upper Heyford and Lakenheath removed. The US always replied -- STFU. Years later, Soviet engineer Adolf Tolkachev confirmed that the Soviets never had any functional responses to the F-111.@LeGenD
A terrain following missile may dupe a single radar or even an AEWACS but it cannot do much against a carefully designed multi layer air defence system comprising both SAM batteries of various ranges as well as old school AA batteries. In terrain hugging mode it will be identified and neutralized through AA fire before it is able to reach the well defended target. Saturation is the only technique against this, and saturation is what the Americans did.
Now take into account the recent Russian jamming of GPS signals during a NATO exercise and you can see that it is easy to take out the very eyes of cruise missiles. That leaves things like TERCOM which again relies on sensors. As a matter of fact, even ground avoidance in terrain following mode relies on sensors. And as soon as you have sensors, you have a weak point.
This is why it would take an air campaign lasting many months to take out a well constructed air defence system.
The problem lies in how we flew the F-111 -- terrain following. Anti aircraft gun emplacements were and still are the least of our problems, namely, they do not know when, how, and which direction the F-111 or the cruise missile will come, and their responses are too slow. When the aircraft, and the cruise missile is an aircraft, can traverse from horizon to horizon in a few seconds, manual AA guns cannot react fast enough. If AA was the solution, the Soviets, as confirmed by Tolkachev, would not have deployed radars throughout the many suspected ingress paths to Moscow.
Which leads to the next item -- air defense radars.
Radar is line-of-sight (LOS) limited.
http://members.home.nl/7seas/radcalc.htm
As such, air defense radar suffers some of the same response disadvantages as AA gun emplacements.
The distance from horizon to horizon is barely 15 miles or 25 km. High subsonic or sub Mach speed is about 600 mph or 1000 km/h at sea level. You do the math.