Ultimately, none of this really matters. Because there is nothing really to be jammed.
Tomahawks navigate today the exact same way they did 35 years ago. By inertial navigation (INS). This is a box inside that tracks how far it has flown along a set course, and determines with it's internal map where it is in relation to the target. This is very proven, secure, bullet-proof technology that does not rely upon any kind of outside communication.
The secondary navigation system is visual (TERCOM - Terrain Contour Matching as well as DSMAC - Digitized Scene-Mapping Area Correlator), using the on-board camera to verify that the terrain under it is what it is expected to see. And the navigation is plotted based upon fixed landmarks. That is why they often fly right over or close to highways, and make turns at mountains and stream crossings. Physical landmarks are large, and impossible to move.
And finally, they use GPS. And yes, this is easily jammed. But the GPS in a Tomahawk is simply the final check made and used for terminal navigation. And because it is the final check, it is also ignored if for some reason it is not available. In other words, it's "accuracy" if GPS is not used would degrade from 1 meter to 10-25 meters.
This is a silly claim, if anybody knows how the Tomahawk operates. GPS is only the 3rd level of navigation, and the system ignores it if it conflicts with the other 2. And the other 2 are purely internal, with absolutely no communication with the outside world. The Russians might as well claim they are going to jam my wrist watch or pocket calculator.
And we have thrown around so many Tomahawk missiles over the last 3 decades, I am sure that the Russians have had many of them in their hands over the years. This has not been "State of the art" technology since Reagan was in office.
